CN120315384A - An intervention system and intervention method for abnormal drop in water level of a deaerator in a nuclear power plant - Google Patents

An intervention system and intervention method for abnormal drop in water level of a deaerator in a nuclear power plant

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Publication number
CN120315384A
CN120315384A CN202510272461.2A CN202510272461A CN120315384A CN 120315384 A CN120315384 A CN 120315384A CN 202510272461 A CN202510272461 A CN 202510272461A CN 120315384 A CN120315384 A CN 120315384A
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CN
China
Prior art keywords
deaerator
abnormal
intervention
module
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202510272461.2A
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Chinese (zh)
Inventor
姜东阁
朱元武
罗泳
李俊杰
杨庆
谢伟
胡皓燊
赵智超
窦哲
袁浩
许仕彬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CNNC Nuclear Power Operation Management Co Ltd
Nuclear Power Qinshan Joint Venture Co Ltd
Original Assignee
CNNC Nuclear Power Operation Management Co Ltd
Nuclear Power Qinshan Joint Venture Co Ltd
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Application filed by CNNC Nuclear Power Operation Management Co Ltd, Nuclear Power Qinshan Joint Venture Co Ltd filed Critical CNNC Nuclear Power Operation Management Co Ltd
Priority to CN202510272461.2A priority Critical patent/CN120315384A/en
Publication of CN120315384A publication Critical patent/CN120315384A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D3/00—Control of nuclear power plant
    • G21D3/001—Computer implemented control
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
    • G05B19/4184—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by fault tolerance, reliability of production system
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C17/00—Monitoring; Testing ; Maintaining
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D3/00—Control of nuclear power plant
    • G21D3/04—Safety arrangements
    • G21D3/06—Safety arrangements responsive to faults within the plant
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/31—From computer integrated manufacturing till monitoring
    • G05B2219/31088—Network communication between supervisor and cell, machine group
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Manufacturing & Machinery (AREA)
  • Quality & Reliability (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

本发明提出了一种核电厂除氧器水位异常下降的干预系统，该系统包括数据采集及监测模块，数据采集及监测模块采集与除氧器水位异常下降的相关设备的运行数据；降功率决策支持模块读取运行数据，并对运行数据进行数据处理，并判断反应堆是否降功率；异常原因判断模块读取运行数据，根据预设逻辑依次对运行数据进行排查，判断除氧器水位异常下降的异常原因；干预措施模块根据异常原因判断模判断得到的异常原因，向操作人员提出干预措施。本发明形成了核电厂除氧器液位异常下降故障诊断的数字化模型，异常原因判断模块通过数字化的手段，快速且准确定位故障点，干预措施模块根据异常原因给出措施建议。

The present invention proposes an intervention system for abnormal drop in water level of a deaerator in a nuclear power plant. The system includes a data acquisition and monitoring module, which collects operating data of equipment related to the abnormal drop in water level of the deaerator; a power reduction decision support module reads the operating data, processes the operating data, and determines whether the reactor should be reduced in power; an abnormal cause judgment module reads the operating data, checks the operating data in sequence according to a preset logic, and determines the abnormal cause of the abnormal drop in water level of the deaerator; and an intervention measure module proposes intervention measures to the operator according to the abnormal cause determined by the abnormal cause judgment module. The present invention forms a digital model for fault diagnosis of abnormal drop in liquid level of a deaerator in a nuclear power plant. The abnormal cause judgment module quickly and accurately locates the fault point by digital means, and the intervention measure module gives measure suggestions according to the abnormal cause.

Description

Intervention system and intervention method for abnormal drop of water level of deaerator of nuclear power plant
Technical Field
The invention relates to the technical field of a conventional island steam-water loop of a nuclear power plant, in particular to a digital intervention method for abnormal water level drop of a deaerator of the nuclear power plant.
Background
Deaerators in nuclear power plants are important devices for removing dissolved oxygen from feedwater to prevent corrosion of the piping and equipment. The proper operation of the deaerator is critical to the safety and efficiency of the nuclear power plant. Deaerator water level control in nuclear power plants is critical to ensure safe operation of equipment and to prevent corrosion. Abnormal water levels in deaerators in nuclear power plants may cause drying and corrosion risks.
In the prior art, when the liquid level of the deaerator of the nuclear power plant is abnormally lowered, no clear whole intervention scheme is needed, the abnormal operation is needed to be processed by the personal skills of operators and alarm regulations, the experience and the technical level of each operator are inconsistent, the alarm regulations are processed based on event guidance, the complicated fault processing has an inapplicable problem, and the fault intervention cannot be performed, the fault processing is delayed, and further serious transients such as shutdown and stack shutdown occur.
Disclosure of Invention
The invention provides an intervention system and an intervention method for abnormal drop of a water level of a deaerator of a nuclear power plant, which are used for solving the problem that delay fault processing is caused by the fact that no clear intervention scheme exists for the problem of abnormal drop of the water level of the deaerator of the nuclear power plant in the prior art.
The technical scheme of the invention is as follows:
The invention provides an intervention system for abnormal water level drop of a deaerator in a nuclear power plant, which comprises a data acquisition and monitoring module, a power reduction decision support module, an abnormal reason judgment module and an intervention measure module, wherein the data acquisition and monitoring module acquires operation data of equipment related to abnormal water level drop of the deaerator, the power reduction decision support module reads the operation data acquired by the data acquisition and monitoring module, processes the operation data and judges whether the power reduction of a steam turbine is performed, the abnormal reason judgment module reads the operation data sampled by the data acquisition and monitoring module, checks the operation data in sequence according to preset logic, judges the abnormal reason of abnormal water level drop of the deaerator, and the intervention measure module provides intervention measures for operators according to the abnormal reason judged by the abnormal reason judgment module.
In some embodiments, the data acquisition and monitoring module is connected to a database of a data acquisition and monitoring system in a main control room of the power station, and the operation data read by the data acquisition and monitoring module comprises the water level of a deaerator water tank, the pressure of the deaerator, the opening degree of 2 deaerator water supply valves, the opening degree of a drain valve of the deaerator water tank, the operation condition of 3 condensate pumps, the liquid level of a condenser, the operation condition of 3 main water supply pumps, the pressure and temperature of a steam extraction pipeline, the opening and closing condition of a steam extraction check valve on the steam extraction pipeline, the opening degree of a drain valve of a high-pressure heater system, and the water inlet and outlet flow of the deaerator water tank.
In some embodiments, the data acquisition and monitoring module displays a deaerator monitoring picture to a user, wherein the picture comprises field operation data directly captured by a main control room data acquisition and monitoring system database, relevant parameters obtained by the power reduction decision support module through operation data processing, and a fault analysis and intervention suggestion logic diagram.
In some embodiments, the data processing of the power-down decision support module comprises the steps of calculating the water level difference between the water level of the deaerator water tank and the setting value of the deaerator water tank, wherein the calculation formula of the water level difference is formula (1):
△N=N currently, the method is that -N Setting up (1)
N currently, the method is that is the water level of a deaerator water tank, N Setting up is a liquid level setting value, and 3 setting values are 1950mm, 1350mm and 350mm respectively;
Calculating the flow difference between the water outlet and the water inlet of the deaerator, wherein the calculation formula of the flow difference is formula (2):
△Q= Q Out of -Q Feeding in (2)
Q Out of is the deaerator water outlet flow, and Q Feeding in is the deaerator water inlet flow;
Calculating the water level descending rate of the deaerator water tank and the time required for reaching 3 setting value water levels, wherein the calculation formula is shown as a formula (3) and a formula (4):
V Lowering blood pressure ＝△Q/SADG (3)
TX＝( N currently, the method is that - N Setting up X)/ V Lowering blood pressure (4)
wherein S ADG is the sectional area of the deaerator, X=1, 2, 3, setting value 1 is 1950mm, setting value 2 is 1350mm, and setting value 3 is 350mm.
In some embodiments, the power-down decision support module judges whether the steam turbine is powered down or not, and specifically comprises the steps of calculating the remaining time of the water level of the deaerator reaching the setting value 3 and comparing with 30 minutes, wherein the power-down decision support module gives a power-down decision to an operator when the remaining time of the water level of the deaerator reaching the setting value 3 is smaller than 30 minutes, and gives a decision to pause the power-down to the operator when the water level of the deaerator water tank is stable and the water supply is larger than the water supply.
In some embodiments, the preset logic of the abnormality cause judgment module is specifically to sequentially check whether a drain valve related to a deaerator water tank is opened by mistake, whether the operation quantity of a condensate pump supplying water to the deaerator by a condenser is abnormal, whether the opening of a deaerator water supply regulating valve is abnormal, whether the opening of a drain valve of a high-pressure heater system is abnormal and whether a steam extraction pipeline is abnormal.
In some embodiments, the abnormality cause judgment module checks whether the opening of the water drain valve of the deaerator water tank is reasonable, whether the running number of 3 condensate pumps is less than 2, whether the opening change rate of the 2 deaerator water supply regulating valves is abnormal, whether the opening change rate of the drain valve of the high-pressure heater system is abnormal, and whether the pressure and the temperature of the steam extraction pipeline are abnormal.
In some embodiments, the intervention of the intervention module is specifically that the deaerator water tank water drain valve is opened by mistake, the intervention module recommends an operator to check whether the deaerator water tank water drain valve is opened or not, if the deaerator water tank water drain valve is opened or not, the condenser supplies water to the deaerator, the intervention module recommends an operator to check the number of the condensate pumps operated, if the number of the condensate pumps operated is less than 2, an operator starts a standby condensate pump, the deaerator water supply valve is abnormal, if the operator verifies that 2 deaerator water supply valves are not automatically opened to the maximum, the operator manually opens the deaerator water supply valve, if the 2 deaerator water supply valves are fully opened but the flow is still insufficient, the operator opens the bypass water supply valve, the intervention module recommends an operator to try to manually control the opening of the drain valve of the high-pressure heater system, and check whether the reactor nuclear power or the thermal power is overrun, the extraction line parameters are abnormal, and the intervention module recommends an operator to check the temperature and pressure parameters of the extraction line.
The invention discloses an intervention method for abnormal drop of the water level of a deaerator of a nuclear power plant, which comprises the following steps:
when the water level of the deaerator of the nuclear power plant abnormally drops, the data acquisition and monitoring module acquires operation data of related equipment for the abnormal water level drop of the deaerator through the data acquisition and monitoring system of the main control room;
The power-down decision support module reads the operation data acquired by the data acquisition and monitoring module, calculates the time required for the water level of the deaerator to reach the pump-tripping fixed value of the main water supply pump, and if the required time is less than 30 minutes, proposes a power-down decision to an operator;
the abnormal reason judging module reads the operation data sampled by the data acquisition and monitoring module, and the abnormal reason judging module sequentially checks the operation data of the equipment according to preset logic, so that abnormal equipment and abnormal reasons are judged;
The intervention measure module is used for giving targeted intervention measures to operators according to the abnormal reasons obtained by the judgment of the abnormal reason judgment module;
After the operator finishes the intervention, the abnormal cause judging module detects the operation data again to evaluate whether the intervention is successful or not, and transmits the evaluation result to the power-down decision support system module.
The implementation of the invention has the following beneficial effects:
The invention provides an intervention system and an intervention method for abnormal drop of the water level of a deaerator of a nuclear power plant, which are characterized in that a data acquisition and monitoring module, a power reduction decision support module, an abnormality cause judgment module and an intervention measure module are designed, A digital model for diagnosing abnormal drop faults of the liquid level of the deaerator of the nuclear power plant is formed, the abnormal cause judging module rapidly and accurately positions fault points through digital means, and the intervention measure module gives measure suggestions according to the abnormal causes.
Drawings
FIG. 1 is a schematic diagram of a diagnostic logic of an intervention system for abnormal water level drop of a deaerator in a nuclear power plant according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of the operation principle of the deaerator of the intervention system for abnormal water level drop of the deaerator of the nuclear power plant according to the embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent, and fully understood, by reference to the accompanying drawings and detailed description, in which embodiments of the invention are shown, some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The nuclear power plant deaerator has the core functions of removing dissolved oxygen and non-condensable gas, removing the dissolved oxygen, carbon dioxide and other gases in the condensed water through heating and physical deaeration, and preventing oxygen corrosion and acid corrosion of equipment such as a two-loop pipeline, a steam generator and the like. The condensate water conveyed by the condensate water pump enters the deaerator through the low-pressure heater to deaerate, and the deaerated condensate water enters the steam generator through the high-pressure heater. Meanwhile, the deaerator is connected with a steam extraction pipeline, the steam extraction pipeline provides a heat source for the deaerator, and heating steam of the steam extraction pipeline comes from steam extraction of a steam turbine. The deaerator water tank is also provided with a deaerator water tank drain valve which is used for deaerator water tank drainage.
In the process, the flow of the condensate entering the deaerator through the condensate pump is controlled through 2 deaerator water supply regulating valves (the equipment numbers are CEX026VL and CEX042 VL), and the deaerated condensate enters the steam generator and is conveyed through 3 main water supply pumps (the equipment numbers are APA102PO, APA202PO and APA302 PO). Therefore, when the deaerator of the nuclear power plant has abnormal water level drop, key equipment mainly needing to be considered comprises a deaerator water supply valve, a deaerator water tank drain valve, a main water supply pump, a condensate pump, a steam extraction pipeline and a drain valve of a high-pressure heater system, and the equipment is related to the water level control of the deaerator of the nuclear power plant, so that the equipment needs to be monitored, and the reason for the abnormal water level drop is found out.
As shown in fig. 1 to 2, the invention provides an intervention system for abnormal drop of the water level of a deaerator in a nuclear power plant, which comprises a data acquisition and monitoring module, a power reduction decision support module, an abnormality cause judgment module and an intervention measure module.
The data acquisition and monitoring module is connected to a database of a main control room data acquisition and monitoring system (called KIT system for short) of the power station, the data acquisition and monitoring module acquires operation data of equipment related to abnormal drop of the water level of the deaerator through the KIT system, the data acquisition and monitoring module acquires the operation data of the equipment related to abnormal drop of the water level of the deaerator through on-site measurement data directly captured by the KIT system database at the frequency of 50ms, and the data specifically comprise the water level of the deaerator water tank, the pressure of the deaerator, the opening degree of 2 deaerator water supply valves (equipment numbers are CEX026VL and CEX042 VL), the opening degree of a deaerator water tank drain valve (equipment numbers are ADG021 VL), the operation condition of 3 condensate pumps (equipment numbers are CEX001PO, CEX002PO and CEX003 PO), the operation condition of 3 main water supply pumps (equipment numbers are APA102PO, APA202PO and APA302 PO), the switching condition of a steam extraction pipeline and the steam extraction check valve on the steam extraction pipeline, and the opening degree of a drain valve on the steam extraction pipeline, and the drain valve of a high-pressure heater system (ADG water heater number is ADG021 and water inlet and drain valve 012). The data acquisition and monitoring module simultaneously displays a deaerator monitoring picture to a user, wherein the picture is divided into three parts, namely, 1, field operation data directly captured by a KIT system database, 2, related parameters obtained by calculation of the operation data by a power-down decision support module, and 3, a fault analysis and intervention suggestion logic diagram is shown in figure 1.
The power-down decision support module reads the operation data of the related equipment of the data acquisition and monitoring module, which is abnormally lowered with the water level of the deaerator, processes the operation data, and according to the data processing result, gives a decision support for whether an operator reduces the power of the steam turbine. The power-down decision support module reads the water level of the deaerator water tank and calculates the difference value between the water level of the deaerator water tank and three setting values, wherein the water level of the deaerator water tank is the average value of data collected by 3 liquid level meters (the equipment numbers are ADG001MN, ADG002MN and ADG005 MN) in the deaerator water tank, and the calculation formula of the water level difference value is formula (1):
△N=N currently, the method is that -N Setting up (1)
wherein N currently, the method is that is the water level of the deaerator water tank, N Setting up is the liquid level setting value, and 3 setting values are 1950mm, 1350mm and 350mm respectively.
The power-down decision support module calculates the flow difference value of the water outlet and the water inlet of the deaerator, and the calculation formula of the flow difference value is formula (2):
△Q= Q Out of -Q Feeding in (2)
Q Out of is the deaerator water outlet flow, and Q Feeding in is the deaerator water inlet flow.
The power-down decision support module calculates the water level descending rate of the deaerator water tank and the time required for reaching 3 setting value water levels, wherein the calculation formula is formula (3) and formula (4):
V Lowering blood pressure ＝△Q/SADG (3)
TX＝( N currently, the method is that - N Setting up X)/ V Lowering blood pressure (4)
wherein S ADG is the sectional area of the deaerator, X=1, 2, 3, setting value 1 is 1950mm, setting value 2 is 1350mm, and setting value 3 is 350mm.
As shown in figure 1, as the pump tripping constant value of the main water supply pump is 350mm, the normal operation setting value of the water level of the deaerator water tank is 2200mm, the three main water supply pumps can be automatically tripped when the water level reaches 350mm, and the pumps are locked to be started, under the working condition, the steam generator cannot supply water, and shutdown are necessary due to insufficient water supply of the two loops. The power-down decision support module is used for obtaining the time left for the current liquid level of the deaerator water tank to reach the water level setting value 1, the water level setting value 2 and the water level setting value 3 through real-time data calculation, comparing the time left for the water level to reach the water level setting value 3 with the minimum intervention time of 30min, and when the required time is less than 30min, providing a power-down decision for an operator. When the water level of the deaerator water tank is stable and the water supply of the water tank is larger than the water output, a decision of suspending the power reduction is made for an operator. The power-down decision support module always reads real-time parameters for calculation, so that the residual time for reaching the water level setting value can be changed due to the fact that an operator locates faults and adopts means to intervene in the water level.
The abnormal cause judging module analyzes the possible water level drop cause according to preset logic, and the preset logic is set according to the probability of fault occurrence, the difficulty level of data grabbing, the severity of the influence of the fault on the water level, the timeliness of operator intervention and the safety analysis of the whole event, wherein the judgment is carried out after multi-angle evaluation, so that the accuracy, the effectiveness, the comprehensiveness and the timeliness of fault positioning are ensured. The fault checking sequence of the logic specifically preset by the abnormality cause judging module is to check whether a drain valve related to a deaerator water tank is opened by mistake (check that the switching value of a drain valve ADG021VL of the deaerator water tank is indicated, namely, a high-level power-on state and a low-level power-off state), whether the operation of a condensate pump for supplying water to the deaerator by a condenser is less than 2 (the start-stop switching value of pumps CEX001PO, CEX002PO and CEX003PO is represented), whether the opening of a deaerator water supply regulating valve is abnormal (the opening change rate of CEX026VL and CEX042VL is represented), whether the opening of a drain valve of a high-pressure heater system is abnormal (the opening change rate of the drain valve of a 5# high-pressure adding deaerator is represented), and whether a steam extraction pipeline heated by a low-pressure cylinder of a steam turbine for the deaerator is abnormal (the temperature and pressure representation of a steam extraction pipeline).
The abnormality cause judging module reads the operation data sampled by the data acquisition and monitoring module, sequentially checks the operation data of the equipment according to the fault checking sequence, firstly checks whether the opening degree of an ADG021VL of a water tank drain valve of the deaerator is reasonable, then sequentially checks whether the operation of CEX001PO, CEX002PO and CEX003PO of a condensate pump is less than 2, whether the opening degree change rate of CEX026VL and CEX042VL of a deaerator water supply regulating valve is abnormal, whether the opening degree change rate of a drain valve of a 5# high-pressure heater system to the deaerator is abnormal, and whether the pressure and the temperature of a steam extraction pipeline are abnormal. When the abnormality cause judging module judges whether the equipment is abnormal, index normal range values of the opening degree, the opening degree change rate, the pressure and the temperature are set by staff according to the actual operation condition of the steam turbine, and when the index monitored by the operation data exceeds the set normal range values, the abnormality cause judging module judges that the equipment is in an abnormal state and transmits the abnormality cause to the intervention measure module.
The intervention measure module judges the obtained abnormal reason according to the abnormal reason judging module, and gives targeted intervention measures to operators, wherein the specific intervention measures are as follows:
if the drain valve ADG021VL associated with the deaerator water tank is opened by mistake, an operator is recommended to verify whether the deaerator water tank drain valve ADG021VL is opened, and if so, the deaerator water tank drain valve ADG021VL is closed at a master control or on site.
If the condensate pump of the condenser supplying water to the deaerator is abnormal in operation, an operator is recommended to verify the number of the condensate pump operation pumps, and if the number of the condensate pumps in operation is less than 2, the operator starts the standby condensate pump.
If the deaerator water supply valve works abnormally, and the operator verifies that the deaerator water supply valves CEX026VL and CEX042VL are not automatically opened to the maximum, the operator manually opens the openings of the CEX026VL and CEX042VL on site or through a master control. If the deaerator water supply valves CEX026VL and CEX042VL are fully open but the flow is still insufficient, the operator opens the bypass water supply valve (apparatus No. CEX025 VL).
If the opening degree of the drain valve of the high-pressure heater system is abnormal, an operator is recommended to try to manually control the opening degree of the drain valve of the 5# high-pressure adding deaerator to check whether the nuclear power or the thermal power of the reactor is out of limit.
If the parameters of the extraction pipeline are abnormal, the operator is recommended to check the related parameter intervention of the extraction pipeline.
After the operator finishes the intervention measures, the abnormal cause judging module detects equipment operation data again to evaluate whether the intervention is successful or not, and transmits the result to the power-down decision support system module, wherein the power-down decision support system module reflects the intervention effect by calculating the water level of the deaerator water tank.
The invention provides an intervention method for abnormal drop of the water level of a deaerator of a nuclear power plant, which comprises the following steps:
When the water level of the deaerator of the nuclear power plant abnormally drops, the data acquisition and monitoring module acquires operation data of equipment related to the abnormal drop of the water level of the deaerator through the data acquisition and monitoring system of a main control room, wherein the operation data specifically comprise the water level of a deaerator water tank, the pressure of the deaerator, the opening degree of water supply valves (with equipment numbers of CEX026VL and CEX042 VL) of the deaerator, the opening degree of a drain valve (with equipment number of ADG021 VL) of the deaerator water tank, the operation condition of 3 condensate pumps (with equipment numbers of CEX001PO, CEX002PO and CEX003 PO), the liquid level of a condenser, the operation condition of 3 main water supply pumps (with equipment numbers of APA102PO, APA202PO and APA302 PO), the pressure and the temperature of a steam extraction pipeline, the opening degree of a steam extraction check valve on the steam extraction pipeline, the opening degree of a drain valve (with equipment number of 5# high-pressure heater system and the water inlet and outlet flow of the deaerator water tank.
The power-down decision support module reads the operation data acquired by the data acquisition and monitoring module, calculates the time required for the water level of the deaerator to reach the main water supply pump-tripping fixed value of 350mm, and if the required time is less than 30 minutes, proposes a power-down decision to an operator, and when the water level of the water tank of the deaerator is stable and the water supply of the water tank is greater than the water output, proposes a decision for suspending the power-down to the operator. When the power-down decision support module calculates the time required for the water level of the deaerator to reach the main water supply pump-skip fixed value of 350mm, the water level difference between the water level of the deaerator water tank and the setting value of the deaerator water tank needs to be calculated, and the calculation formula of the water level difference is shown as formula (1):
△N=N currently, the method is that -N Setting up (1)
wherein N currently, the method is that is the water level of the deaerator water tank, N Setting up is a liquid level setting value, 3 setting values are 1950mm, 1350mm and 350mm respectively, and setting value 3 is a main water supply pump tripping setting value.
Secondly, calculating a flow difference value of the water outlet and the water inlet of the deaerator, wherein a calculation formula of the flow difference value is shown as a formula (2):
△Q= Q Out of -Q Feeding in (2)
Q Out of is the deaerator water outlet flow, and Q Feeding in is the deaerator water inlet flow.
Then calculating the water level descending rate of the deaerator water tank and the time required for reaching 3 setting value water levels, wherein the calculation formula is shown as a formula (3) and a formula (4):
V Lowering blood pressure ＝△Q/SADG (3)
TX＝( N currently, the method is that - N Setting up X)/ V Lowering blood pressure (4)
Wherein S ADG is the sectional area of the deaerator, X=1, 2 and 3, setting value 1 is 1950mm, setting value 2 is 1350mm, setting value 3 is 350mm, and setting value 3 is the main water supply pump tripping setting value.
Finally, comparing T 3 with 30 minutes, and reducing the power to the decision support module so as to give a decision support.
The abnormal reason judging module reads the operation data sampled by the data acquisition and monitoring module, and the abnormal reason judging module sequentially checks the operation data of the equipment according to preset logic, so that abnormal equipment and abnormal reasons are judged. The fault checking sequence of the logic specifically preset by the abnormality cause judging module is that whether a drain valve related to a deaerator water tank is opened by mistake (EC level representation of a drain valve ADG021VL of the deaerator water tank is checked), whether the operation of a condensate pump for supplying water to the deaerator by a condenser is less than 2 (CEX 001PO, CEX002PO and CEX003PO pump start-stop EC level representation), whether the opening of a deaerator water supply regulating valve is abnormal (CEX 026VL and CEX042VL opening change rate representation), whether the opening of a drain valve of a high-pressure heater system is abnormal (5 # high-pressure drain valve opening change rate representation of the deaerator), and whether a steam extraction pipeline heated by a steam turbine low-pressure cylinder for the deaerator is abnormal (temperature and pressure representation of the steam extraction pipeline).
The intervention measure module is used for giving targeted intervention measures to operators according to the abnormal reasons obtained by the judgment of the abnormal reason judgment module. The specific intervention measures are as follows:
If the drain valve ADG021VL associated with the deaerator water tank is opened by mistake, an operator is recommended to verify whether the deaerator water tank drain valve ADG021VL is opened, and if so, the deaerator water tank drain valve ADG021VL is closed at a master control or on site. If the condensate pump of the condenser supplying water to the deaerator is abnormal in operation, an operator is recommended to verify the number of the condensate pump operation pumps, and if the number of the condensate pumps in operation is less than 2, the operator starts the standby condensate pump. If the deaerator water supply valve works abnormally, and the operator verifies that the deaerator water supply valves CEX026VL and CEX042VL are not automatically opened to the maximum, the operator manually opens the openings of the CEX026VL and CEX042VL on site or through a master control. If the deaerator water supply valves CEX026VL and CEX042VL are fully open but the flow is still insufficient, the operator opens the bypass water supply valve (apparatus No. CEX025 VL). If the opening degree of the drain valve of the high-pressure heater system is abnormal, an operator is recommended to try to manually control the opening degree of the drain valve of the 5# high-pressure adding deaerator to check whether the nuclear power or the thermal power of the reactor is out of limit. If the parameters of the extraction pipeline are abnormal, the operator is recommended to check the related parameter intervention of the extraction pipeline.
After the operator finishes the intervention measures, the abnormal cause judging module detects equipment operation data again to evaluate whether the intervention is successful or not, and transmits the result to the power-down decision support system module, wherein the power-down decision support system module reflects the intervention effect by calculating the water level of the deaerator water tank.
The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (10)

1. The intervention system for abnormal water level drop of the deaerator in the nuclear power plant is characterized by comprising a data acquisition and monitoring module, a power reduction decision support module, an abnormal reason judgment module and an intervention measure module, wherein the data acquisition and monitoring module acquires operation data of related equipment for abnormal water level drop of the deaerator, the power reduction decision support module reads the operation data acquired by the data acquisition and monitoring module, processes the operation data and judges whether a turbine reduces power, the abnormal reason judgment module reads the operation data sampled by the data acquisition and monitoring module, checks the operation data in sequence according to preset logic, judges the abnormal reason of abnormal water level drop of the deaerator, and the intervention measure module provides intervention measures for operators according to the abnormal reason judged by the abnormal reason judgment module.
2. The intervention system for abnormal drop of water level of a deaerator in a nuclear power plant according to claim 1, wherein the data acquisition and monitoring module is connected to a database of a data acquisition and monitoring system in a main control room of a power station, and the operation data read by the data acquisition and monitoring module comprises deaerator water tank water level, deaerator pressure, opening of 2 deaerator water supply valves, opening of deaerator water tank drain valves, operating conditions of 3 condensate pumps, liquid level of a condenser, operating conditions of 3 main water supply pumps, pressure and temperature of a steam extraction pipeline, opening of a steam extraction check valve on the steam extraction pipeline, opening of a drain valve of a high-pressure heater system, water inlet and water outlet flow of the deaerator water tank.
3. The intervention system for abnormal drop of water level of a deaerator in a nuclear power plant according to claim 2, wherein the data acquisition and monitoring module displays a deaerator monitoring picture to a user, and the picture comprises field operation data directly captured by a master control room data acquisition and monitoring system database, relevant parameters obtained by the power reduction decision support module through operation data processing, and fault analysis and intervention suggestion logic diagrams.
4. The intervention system for abnormal water level drop of a deaerator in a nuclear power plant according to claim 2, wherein the data processing of the power-down decision support module comprises the steps of calculating a water level difference between a deaerator water tank and a deaerator water tank setting value, wherein the calculation formula of the water level difference is formula (1):
△N=N currently, the method is that -N Setting up (1)
N currently, the method is that is the water level of a deaerator water tank, N Setting up is a liquid level setting value, and 3 setting values are 1950mm, 1350mm and 350mm respectively;
Calculating the flow difference between the water outlet and the water inlet of the deaerator, wherein the calculation formula of the flow difference is formula (2):
Δq=q Out of -Q Feeding in (2)Q Out of is deaerator water outlet flow, Q Feeding in is deaerator water inlet flow;
Calculating the water level descending rate of the deaerator water tank and the time required for reaching 3 setting value water levels, wherein the calculation formula is shown as a formula (3) and a formula (4):
V Lowering blood pressure ＝△Q/SADG (3)
TX＝( N currently, the method is that - N Setting up X)/ V Lowering blood pressure (4)
wherein S ADG is the sectional area of the deaerator, X=1, 2, 3, setting value 1 is 1950mm, setting value 2 is 1350mm, and setting value 3 is 350mm.
5. The intervention system for abnormal drop of water level of a deaerator in a nuclear power plant according to claim 4, wherein the power-down decision support module judges whether the turbine is powered down or not specifically comprises the steps of calculating the remaining time for the deaerator water level to reach a setting value 3 to be compared with 30 minutes, and when the remaining time for the deaerator water level to reach the setting value 3 is less than 30 minutes, the power-down decision support module makes a decision for reducing power to an operator, and when the deaerator water tank water level is stable and the water supply is greater than the water outlet, the power-down decision support module makes a decision for suspending the power reduction to the operator.
6. The intervention system for abnormal drop of water level of deaerator in nuclear power plant according to claim 2, wherein the preset logic of the abnormality cause judgment module is specifically to sequentially check whether a drain valve related to a deaerator water tank is opened by mistake, whether the number of condensate pumps for supplying water to the deaerator by a condenser is abnormal, whether the opening of a deaerator water supply regulating valve is abnormal, whether the opening of a drain valve of a high-pressure heater system is abnormal, and whether a steam extraction pipeline is abnormal.
7. The intervention system for abnormal drop of water level of a deaerator in a nuclear power plant according to claim 6, wherein the abnormality cause judgment module checks whether the opening of a water drain valve of a deaerator water tank is reasonable, whether the operation quantity of 3 condensate pumps is less than 2, whether the opening change rate of 2 deaerator water supply regulating valves is abnormal, whether the opening change rate of a drain valve of a high-pressure heater system is abnormal, and whether the pressure and the temperature of a steam extraction pipeline are abnormal.
8. The intervention system for abnormal drop of water level of deaerator in nuclear power plant according to claim 7, wherein the intervention of the intervention module is specifically that a deaerator water tank water drain valve is opened by mistake, the intervention module suggests that an operator check whether the deaerator water tank water drain valve is opened or not, if so, the deaerator water drain valve is closed, the condensate pump of the condenser supplying water to the deaerator is abnormal, the intervention module suggests that the operator check the number of the condensate pump operating pumps, if the number of the operating condensate pumps is less than 2, the operator starts a standby condensate pump, the deaerator water supply valve is abnormal, if the operator check that 2 deaerator water supply valves are not opened to the maximum, the operator manually opens the deaerator water supply valve, if the 2 deaerator water supply valves are opened fully but the flow is still insufficient, the operator opens the bypass water supply valve, the drain valve of the high-pressure heater system is abnormal, the intervention module suggests that the operator manually controls the drain valve opening of the high-pressure heater system, and checks whether the reactor nuclear power or thermal power is over-limited, the extraction parameters, and the intervention module suggests that the temperature of the steam line is abnormal.
9. The intervention system for abnormal drop of water level in a deaerator of a nuclear power plant of claim 1, wherein said data acquisition and monitoring module acquires operational data at a frequency of 50 ms.
10. The intervention method for abnormal drop of water level of deaerator in nuclear power plant according to claims 1-9, characterized in that said method comprises:
when the water level of the deaerator of the nuclear power plant abnormally drops, the data acquisition and monitoring module acquires operation data of related equipment for the abnormal water level drop of the deaerator through the data acquisition and monitoring system of the main control room;
The power-down decision support module reads the operation data acquired by the data acquisition and monitoring module, calculates the time required for the water level of the deaerator to reach the pump-tripping fixed value of the main water supply pump, and if the required time is less than 30 minutes, proposes a power-down decision to an operator;
the abnormal reason judging module reads the operation data sampled by the data acquisition and monitoring module, and the abnormal reason judging module sequentially checks the operation data of the equipment according to preset logic so as to judge the abnormal equipment and the abnormal reason;
The intervention measure module is used for giving targeted intervention measures to operators according to the abnormal reasons obtained by the judgment of the abnormal reason judgment module;
After the operator finishes the intervention, the abnormal cause judging module detects the operation data again to evaluate whether the intervention is successful or not, and transmits the evaluation result to the power-down decision support system module.
CN202510272461.2A 2025-03-10 2025-03-10 An intervention system and intervention method for abnormal drop in water level of a deaerator in a nuclear power plant Pending CN120315384A (en)

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