CN111584109A - Cavity building control method and device for voltage stabilizer of nuclear power unit - Google Patents
Cavity building control method and device for voltage stabilizer of nuclear power unit Download PDFInfo
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- CN111584109A CN111584109A CN202010338024.3A CN202010338024A CN111584109A CN 111584109 A CN111584109 A CN 111584109A CN 202010338024 A CN202010338024 A CN 202010338024A CN 111584109 A CN111584109 A CN 111584109A
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- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
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- G21D3/08—Regulation of any parameters in the plant
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Abstract
The application belongs to the technical field of a loop voltage stabilizer of a nuclear power station, and provides a method and a device for controlling cavity building of a voltage stabilizer of a nuclear power unit, wherein the method comprises the following steps: if the operation information of the voltage stabilizer meets the cavity building triggering condition, controlling the upper charging flow of the RCV system to be maintained within a preset flow range, and increasing the lower discharging flow of the RCV system; adjusting the opening of the pressure control valve according to the measured pressure downstream of the lower bleed orifice plate; closing the connection control valve; if the downward discharge flow rate is reduced to a first preset flow rate, reducing the opening amount of the pressure control valve; if the downward discharge flow rate is reduced to a second preset flow rate, stopping the adjustment of the pressure control valve, and increasing the opening amount of the connection control valve; if the lower discharge flow rises to a third preset flow, stopping the adjustment of the connection control valve, and reducing the upper charging flow; and if the upper charging flow is reduced to a fourth preset flow and the water level in the voltage stabilizer reaches a preset water level, controlling the voltage stabilizer to execute cavity building operation. The invention can reduce the temperature rise speed and amplitude of the upper filling fluid and has control effect on transient.
Description
Technical Field
The invention belongs to the technical field of a nuclear power station primary loop voltage stabilizer, and particularly relates to a nuclear power unit voltage stabilizer cavity building control method and device.
Background
At present, the design operation life of a nuclear power unit in the world is 40 years, and the nuclear power unit generally operates for 60 years or even 80 years after safety evaluation. From the transient statistics perspective, when the unit is operated to the end of the service life (40 years), the margin of the residual transient is larger, the reactor loop is safer and more reliable, so the feedback and control of the severe transient, and the optimization of the operation is particularly important for prolonging the service life of the unit.
In the use process of the existing nuclear power unit, when a steam cavity of the voltage stabilizer is established, the pressure at the downstream of a lower vent plate is uncontrollably reduced along with the closing of a control valve on a connecting pipeline between an RRA system (a waste heat discharge system) and an RCV system (a chemical and volume control system), so that the lower discharge flow passing through a regenerative heat exchanger is increased, the temperature of an upper charging fluid is rapidly increased under the condition that the upper charging flow is not changed, the amplitude exceeds over 107 ℃, serious transient is generated, the transient threatens the strength of the connecting pipe area of the upper charging pipeline of the RCV system and a main loop of the RCP system (a reactor coolant system), and the serious transient of the RCV system caused in the process of establishing the steam cavity of the voltage stabilizer in the prior art can not be effectively actively controlled, so that the service life of the nuclear power unit is reduced.
Disclosure of Invention
The embodiment of the application provides a nuclear power generating unit voltage stabilizer cavity building control method and device, and aims to solve the problem that the service life of a nuclear power generating unit is short due to the fact that severe transient in an RCV system caused in the process of building a steam cavity by a voltage stabilizer cannot be effectively and actively controlled in the using process of the existing nuclear power generating unit.
In a first aspect, an embodiment of the present application provides a method for controlling a cavity building of a voltage stabilizer of a nuclear power generating unit, where the method includes:
acquiring operation information of the voltage stabilizer, and if the operation information meets a cavity building triggering condition, controlling the upper charging flow of the RCV system to be maintained within a preset flow range, and increasing the lower discharging flow of the RCV system;
acquiring the measured pressure at the downstream of the lower drain hole plate, and adjusting the opening of the pressure control valve according to the measured pressure;
closing a connection control valve between the RCV system and the RRA system, and acquiring the downward discharge flow of the RCV system;
if the downward flow of the RCV system is reduced to a first preset flow, reducing the opening amount of the pressure control valve to reduce the downward flow of the RCV system, so that the rising rate of the downward flow in a transient time interval is reduced;
continuously controlling the voltage stabilizer to keep the upper charging flow of the RCV system within the preset flow range;
if the downward discharge flow of the RCV system is reduced to a second preset flow, stopping the adjustment of the opening amount of the pressure control valve, and increasing the opening amount of the connection control valve to increase the downward discharge flow of the RCV system;
if the downward discharge flow of the RCV system rises to a third preset flow, stopping the opening adjustment of the connection control valve, and reducing the upward charging flow of the RCV system;
and if the upper charging flow of the RCV system is reduced to a fourth preset flow and the water level in the voltage stabilizer reaches a preset water level, balancing the upper charging flow and the lower discharging flow of the RCV system and controlling the voltage stabilizer to execute cavity building operation.
Compared with the prior art, the embodiment of the application has the advantages that: after the connection control valve is closed, the opening amount of the pressure control valve in the RCV system is reduced, the downward discharge rate of the RCV system and the pressure reduction speed of the downward discharge hole plate are reduced, the rising rate of the downward discharge rate in a transient time interval is reduced, the rising speed of the upward charge rate caused by water level balance of the voltage stabilizer is smaller, the heating speed and amplitude of the upward charge fluid are reduced, the temperature amplitude of the upward charge fluid is prevented from exceeding 107 ℃, the active control effect on serious transient is effectively achieved, the service life of the nuclear power unit is prolonged, the downward discharge rate is increased to a third preset flow rate, the upward charge rate is reduced to a fourth preset flow rate, the downward discharge rate and the upward charge rate meet the cavity building flow rate state of the voltage stabilizer, and the building stability of a voltage stabilizer air cavity is guaranteed.
Further, after the step of obtaining the operation information of the voltage regulator, the method further includes:
and if the voltage stabilizer is continuously in a preset temperature range under the control of the pressure control valve within a preset time, judging that the operation information meets the cavity building triggering condition.
Further, after the step of adjusting the opening degree of the pressure control valve according to the measured pressure, the method further includes:
judging whether the measured pressure is smaller than a pressure threshold value;
and when the measured pressure is judged to be smaller than the pressure threshold value, sending a low-pressure prompt aiming at the lower vent plate.
Further, after the step of increasing the bleed-down flow of the RCV system, the method further comprises:
and monitoring the pressure value of the RCP system, and controlling the pressure value of the RCP system to be maintained within a preset pressure range.
Further, the preset flow range is 6 to 7m3H, the first preset flow is 11m3H, the second preset flow is 5m3H, the third preset flow is 28.5m3H, the fourth preset flow is 3.4m3/h。
Further, the pressure threshold is 10 bar, and the preset water level is-4 m.
In a second aspect, an embodiment of the present application provides a nuclear power generating set voltage stabilizer cavity building control device, including:
the cavity building triggering module is used for acquiring the operation information of the voltage stabilizer, controlling the upper charging flow of the RCV system to be maintained within a preset flow range and increasing the lower discharging flow of the RCV system if the operation information meets the cavity building triggering condition;
the first valve adjusting module is used for acquiring the measured pressure at the downstream of the lower drain hole plate and adjusting the opening of the pressure control valve according to the measured pressure;
the lower leakage flow detection module is used for closing a connection control valve between the RCV system and the RRA system and acquiring the lower leakage flow of the RCV system;
a second valve adjustment module for decreasing the opening amount of the pressure control valve to decrease the letdown flow of the RCV system if the letdown flow of the RCV system decreases to a first preset flow, so that the rate of increase of the letdown flow within a transient time interval decreases;
the water level balance control module is used for continuously controlling the voltage stabilizer to keep the upper charging flow of the RCV system within the preset flow range;
the third valve adjusting module is used for stopping the adjustment of the opening amount of the pressure control valve and increasing the opening amount of the connection control valve to increase the downward discharge flow of the RCV system if the downward discharge flow of the RCV system is reduced to a second preset flow;
the upper charging flow control module is used for stopping the opening adjustment of the connection control valve and reducing the upper charging flow of the RCV system if the lower discharging flow of the RCV system rises to a third preset flow;
and the cavity building control module is used for balancing the upper charging flow and the lower discharging flow of the RCV system if the upper charging flow of the RCV system is reduced to a fourth preset flow and the water level in the voltage stabilizer reaches a preset water level, and controlling the voltage stabilizer to execute the cavity building operation.
Further, the cavity building triggering module is further configured to:
and if the voltage stabilizer is continuously in a preset temperature range under the control of the pressure control valve within a preset time, judging that the operation information meets the cavity building triggering condition.
Further, the cavity control device is built to nuclear power generating set stabiliser still includes:
the pressure monitoring module is used for judging whether the measured pressure is smaller than a pressure threshold value;
and when the measured pressure is judged to be smaller than the pressure threshold value, sending a low-pressure prompt aiming at the lower vent plate.
Further, the cavity control device is built to nuclear power generating set stabiliser still includes:
and the pressure stabilizing control module is used for monitoring the pressure value of the RCP system and controlling the pressure value of the RCP system to be maintained within a preset pressure range.
It is understood that the beneficial effects of the second aspect can be referred to the related description of the first aspect, and are not described herein again.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the embodiments or the description of the prior art will be briefly described below.
Fig. 1 is a schematic diagram of a connection structure between an RCV system, an RRA system, and a voltage regulator according to a first embodiment of the present application;
FIG. 2 is a flowchart of a nuclear power generating unit voltage stabilizer cavity building control method according to a first embodiment of the present application;
FIG. 3 is a flowchart of a nuclear power generating unit voltage regulator cavity building control method according to a second embodiment of the present application;
fig. 4 is a schematic structural diagram of a nuclear power generating unit voltage regulator cavity building control device according to a third embodiment of the present application;
fig. 5 is a schematic structural diagram of a terminal device according to a fourth embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to" determining "or" in response to detecting ". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
Example one
Fig. 1 is a schematic diagram of a connection structure between an RCV system, an RRA system, and a voltage stabilizer according to a first embodiment of the present disclosure, where the RCV system and the RRA system are controlled to be switched by a connection control valve 310VP, the voltage stabilizer is connected to a regenerative heat exchanger 001EX, an upper charge flow rate detection device 018MD and an upper charge fluid temperature detection device 019MT are disposed on the regenerative heat exchanger 001EX, the upper charge flow rate detection device MD is used to detect a flow rate of an upper charge fluid of the RCV system, the upper charge fluid temperature detection device 019MT is used to detect a temperature of the upper charge fluid, a lower discharge flow rate detection device 005MD, a lower discharge pressure detection device MP 004 and a pressure control valve 013VP are disposed on a lower discharge pipeline of the RCV system, and the lower discharge rate detection device 005MD is used to detect a lower discharge rate of the RCV system.
Specifically, there are two factors in determining the transient of the RCV system: the change rate of the temperature of the charging fluid (019MT detection value); the second is the change amplitude (019MT detection value) of the upper charging fluid temperature, the former judges whether transient exists or not, and the latter judges the transientVarying severity when Δ T is judgedRCVWhen the/T is more than 20 ℃/h, the RCV system is judged to have transient, T is transient time interval, and delta TRCVThe magnitude of change in the transient time interval is detected by the upper charge fluid temperature detection means 019 MT.
The classes of transients include: transient 33: delta TRCV< 30 ℃ (limit 12000 times);
transient 32.1: delta T at 30 ℃ [ <RCV< 47 ℃ (limit 12000 times);
transient 34: delta T at 47 ℃ [RCV< 67 ℃ (limit 12000 times);
transient 35: delta T at 67 DEG CRCV< 87 ℃ (limit 11200 times);
transient 36: delta T at 87 ℃ [ delta ]RCV< 107 ℃ (limit 800 times);
transient 32.2: delta T at 107 ℃ [RCV< 228 ℃ (limit 300 times);
transient 37: delta T at 228 ℃ [ <RCV(limit 220 times);
transient 38: delta T at 228 ℃ [ <RCV(Limit 200 times).
Referring to fig. 2, a flowchart of a cavity establishment control method for a voltage regulator of a nuclear power generating unit according to a first embodiment of the present application includes the steps of:
step S10, acquiring the operation information of the voltage stabilizer, and judging whether the operation information meets the cavity building triggering condition;
the operation information comprises the current operation time, the current temperature and the like of the voltage stabilizer, and preferably, condition parameters in the cavity building triggering condition can be set according to the requirements of users;
for example, the cavity building triggering condition may be set to determine whether a cavity building instruction sent by a worker is currently received, or determine whether the current operation time reaches a preset cavity building time point, or determine whether the current temperature is within a preset temperature range.
Preferably, when a cavity building instruction sent by a worker is received, if the operation information does not meet the cavity building triggering condition, a waiting prompt is sent to the worker, the waiting prompt can prompt a user that the cavity building triggering condition is not met currently in a text, voice or image mode so as to prompt the worker that the cavity building operation cannot be performed on the environment state in the voltage stabilizer until the operation information is judged to meet the cavity building triggering condition.
If the operation information meets the cavity building triggering condition, executing step S20;
step S20, controlling the upper charging flow of the RCV system to be maintained within a preset flow range, and increasing the lower discharging flow of the RCV system;
step S30, obtaining the measuring pressure at the downstream of the lower discharging hole plate, and adjusting the opening of the pressure control valve according to the measuring pressure;
the measured pressure at the downstream of the lower vent plate is obtained by reading the detection value of the lower vent pressure detection device 004MP, preferably, a pressure control table is pre-stored locally, and the corresponding relationship between different measured pressures and the control opening degree of the corresponding pressure control valve is stored in the pressure control table, so in this step, the target control opening degree is obtained by matching the obtained measured pressure with the pressure control table, and the opening degree of the pressure control valve is adjusted according to the target control opening degree.
Specifically, in this step, the opening degree of the pressure control valve is adjusted in real time according to the detection value of the let-down pressure detection device 004MP, so that the opening degree of the pressure control valve is synchronously adjusted according to the detection value of the let-down pressure detection device 004 MP.
For example, when it is determined that the detection value of the let-down pressure detection device 004MP is high, the opening degree of the pressure control valve is decreased to maintain the pressure of the let-down flow rate in a balanced manner, thereby effectively preventing the pressure of the let-down flow rate from being excessively high.
Step S40, closing a connection control valve between the RCV system and the RRA system, and acquiring the downward leakage flow of the RCV system;
wherein, the connection control valve 310VP is closed to reduce the leakage flow rate in the RCV system, and the leakage flow rate is detected in real time by the leakage flow rate detection device 005 MD;
step S50, if the bleed-down flow of the RCV system decreases to a first preset flow, decreasing the opening amount of the pressure control valve to decrease the bleed-down flow of the RCV system, so that the rising rate of the bleed-down flow within a transient time interval decreases;
in this embodiment, the first preset flow may be set to 11m according to a requirement for setting a parameter value3H, i.e. when it is judged that the detection value of the bleed-down flow rate detection device 005MD has dropped to 11m3And when the pressure is measured in the second time interval,/h, the opening amount of the pressure control valve is reduced to reduce the downward discharge flow of the RCV system, so that the rising rate of the downward discharge flow in a transient time interval is reduced, the pressure (the downward discharge pressure detection device 004MP) at the downstream of the downward discharge orifice plate is controlled, and the serious transient phenomenon caused by uncontrollable pressure at the downstream of the downward discharge orifice plate is prevented.
Specifically, in this step, when the connection control valve 310VP between the RCV system and the RRA system is closed, the detection value of the bleed-down pressure detection device 004MP is rapidly decreased, and at this time, the bleed-down flow rate of the RCV system is changed according to the detection value of the bleed-down pressure detection device 004MP, that is, the bleed-down flow rate of the RCV system is rapidly increased, so that in this step, the rate of increase of the bleed-down flow rate in one transient time interval is decreased by decreasing the opening amount of the pressure control valve;
step S60, continuously controlling the voltage stabilizer to keep the upper charging flow of the RCV system in the preset flow range so as to maintain the water level balance of the upper charging flow and the lower discharging flow;
wherein the preset flow range is 6 to 7m3And/h, because the rising rate of the lower discharge flow is reduced, the liquid levels of the upper charging fluid and the lower discharge fluid are automatically balanced by controlling the voltage stabilizer, so that the rising speed of the upper charging flow of the upper charging fluid is reduced, the heating speed of the upper charging fluid is further reduced, and the change amplitude of the upper charging fluid in a transient time interval is controlled to be smaller than 107 ℃.
Step S70, if the downward flow of the RCV system is reduced to a second preset flow, stopping the adjustment of the opening degree of the pressure control valve, and increasing the opening degree of the connection control valve to increase the downward flow of the RCV system;
when the lower discharge flow is reduced to a second preset flow, the water level of the current upper charging flow and the current lower discharge flow is judged to be in a balanced state, at the moment, the opening degree of the pressure control valve is stopped to be adjusted, the opening degree of the connection control valve is increased, the lower discharge flow of the RCV system is increased, the upper charging flow and the upper charging fluid temperature are increased, and preferably, the second preset flow is 5m3/h。
Step S80, if the downward flow of the RCV system rises to a third preset flow, stopping the opening adjustment of the connection control valve, and reducing the upward charging flow of the RCV system;
when the lower discharge flow of the RCV system is judged to rise to a third preset flow, the current lower discharge flow is judged to be in a standard flow state, namely the current lower discharge flow state meets the requirement of a pressure stabilizer for establishing a steam cavity, the upper charge flow of the RCV system is reduced to adjust the upper charge flow to be in a corresponding standard flow state, and preferably, the third preset flow is 28.5m3/h。
Step S90, if the upper charging flow of the RCV system is reduced to a fourth preset flow and the water level in the voltage stabilizer reaches a preset water level, balancing the upper charging flow and the lower discharging flow of the RCV system and controlling the voltage stabilizer to execute cavity building operation;
if the upper charging flow of the RCV system is reduced to a fourth preset flow, the upper charging flow is judged to be in a standard flow state at the moment, namely the current state of the upper charging flow meets the requirement of a pressure stabilizer for establishing a steam cavity, the pressure stabilizer is executed for establishing a cavity, and preferably, the fourth preset flow is 3.4m3And h, the preset water level is-4 meters.
In this embodiment, after the connection control valve is closed, the opening amount of the pressure control valve in the RCV system is reduced, so as to reduce the pressure drop rate of the lower bleed flow rate and the lower bleed orifice plate of the RCV system, and further reduce the rise rate of the lower bleed flow rate in a transient time interval, so that the rise rate of the upper bleed flow rate caused by the water level balance of the pressure stabilizer is smaller, and further reduce the temperature rise rate and the amplitude of the upper bleed flow rate, and prevent the temperature amplitude of the upper bleed flow rate from exceeding 107 ℃, so that the active control effect on severe transient is effectively achieved, the service life of the nuclear power unit is prolonged, and the lower bleed flow rate is increased to the third preset flow rate, and the upper bleed rate is reduced to the fourth preset flow rate, so that the lower bleed rate and the upper bleed rate meet the flow rate state of the pressure stabilizer building cavity, and the stability of building of the air cavity is ensured.
Example two
Referring to fig. 3, a flowchart of a cavity establishment control method for a voltage regulator of a nuclear power generating unit according to a second embodiment of the present application includes the steps of:
step S11, judging whether the voltage stabilizer is continuously in a preset temperature range under the control of the pressure control valve within preset time;
in this embodiment, the preset time may be set in a time interval manner, for example, the preset time may be set to 5 minutes, 10 minutes, or 15 minutes, and the preset temperature range may be set to 210 ℃ to 240 ℃;
in addition, before the step of determining whether the pressure regulator is continuously within the preset temperature range under the control of the pressure control valve within the preset time, the method further includes:
judging whether the detection value of the lower pressure detection device is equal to a detection threshold value or not;
and if the detection value of the pressure detection device is not equal to the detection threshold value, adjusting the opening amount of the pressure control valve, and stopping the adjustment of the pressure control valve until the detection value of the pressure detection device is equal to the detection threshold value.
In this embodiment, the detection threshold is 25 bar, that is, when the detected value of the pressure-drop detection device is determined to be equal to 25 bar, it is determined whether the temperature of the voltage stabilizer is within the preset temperature range according to the preset time interval.
For example, the preset time is set to 10 minutes, and when it is determined that the detection value of the pressure detecting device is equal to the detection threshold value at 8 am, it is determined whether the temperature of the regulator is continuously within the preset temperature range from 8 am to 8 am and 10 minutes.
If the temperature of the voltage stabilizer in the process from 8 o 'clock to 8 o' clock and 10 o 'clock is not continuously in the preset temperature range, whether the temperature of the voltage stabilizer in the process from 8 o' clock to 8 o 'clock and 11 o' clock is continuously in the preset temperature range is judged.
If the voltage stabilizer is continuously in the preset temperature range under the control of the pressure control valve within the preset time, determining that the voltage stabilizer meets the cavity building triggering condition, and executing step S21;
step S21, controlling the upper charging flow of the RCV system to be maintained within a preset flow range, increasing the lower discharging flow of the RCV system, monitoring the pressure value of the RCP system, and controlling the pressure value of the RCP system to be maintained within the preset pressure range;
and in the step, the pressure value of the RCP system is monitored and controlled to be maintained within a preset pressure range, so that the influence of pressure value fluctuation in the RCP system on the RCV system or the voltage stabilizer system is prevented.
Step S31, obtaining the measured pressure at the downstream of the lower drain hole plate, and adjusting the opening of the pressure control valve according to the measured pressure;
the measured pressure at the downstream of the lower vent plate is obtained by reading the detection value of the lower vent pressure detection device 004MP, preferably, a pressure control table is pre-stored locally, and the corresponding relationship between different measured pressures and the control opening degree of the corresponding pressure control valve is stored in the pressure control table, so in this step, the target control opening degree is obtained by matching the obtained measured pressure with the pressure control table, and the opening degree of the pressure control valve is adjusted according to the target control opening degree.
Specifically, in this step, after the step of adjusting the opening degree of the pressure control valve based on the measured pressure, the method further includes:
judging whether the measured pressure is smaller than a pressure threshold value;
when the measured pressure is smaller than the pressure threshold value, a low-pressure prompt is sent for the lower vent plate, wherein the pressure threshold value can be set according to the requirement, the pressure threshold value is used for judging whether the downstream pressure of the lower vent plate is smaller than the standard pressure, and when the downstream pressure of the lower vent plate is smaller than the standard pressure, the design of the low-pressure prompt is sent, and a worker is reminded to overhaul or investigate, preferably, the pressure threshold value is 10 bar.
Step S41, closing a connection control valve between the RCV system and the RRA system, and acquiring the downward discharge flow of the RCV system;
wherein the connection control valve 310VP is closed and the bleed-down flow is monitored in real time by the bleed-down flow detection device 005 MD.
Step S51, if the downward flow of the RCV system is reduced to a first preset flow, the opening amount of the pressure control valve is reduced;
when the opening amount of the pressure control valve is decreased, the effect of decreasing the downward flow of the RCV system is achieved, so that the rising rate of the downward flow in a transient time interval is decreased, preferably, the first preset flow can be set as a parameter value according to a requirement, in this embodiment, the first preset flow is set as 11m3H, i.e. when it is judged that the detection value of the bleed-down flow rate detection device 005MD has dropped to 11m3And when the pressure is measured in the second time interval,/h, the opening amount of the pressure control valve is reduced to reduce the downward discharge flow of the RCV system, so that the rising rate of the downward discharge flow in a transient time interval is reduced, the pressure (the downward discharge pressure detection device 004MP) at the downstream of the downward discharge orifice plate is controlled, and the serious transient phenomenon caused by uncontrollable pressure at the downstream of the downward discharge orifice plate is prevented.
Step S61, controlling the voltage stabilizer to reduce the rising speed of the upper charging flow of the RCV system so as to maintain the water level balance of the upper charging flow and the lower discharging flow;
the rising rate of the lower discharge flow is reduced, and the liquid levels of the upper charging fluid and the lower discharge fluid are automatically balanced by controlling the voltage stabilizer, so that the rising rate of the upper charging flow of the upper charging fluid is reduced, the heating rate of the upper charging fluid is further reduced, and the change amplitude of the upper charging fluid in a transient time interval is controlled to be smaller than 107 ℃.
Step S71, if the downward flow of the RCV system is reduced to a second preset flow, stopping the opening amount adjustment of the pressure control valve, and increasing the opening amount of the connection control valve to increase the downward flow of the RCV system;
wherein the second preset flow rate is 5m3And h, when the lower discharge flow is reduced to a second preset flow, judging that the water levels of the current upper charging flow and the current lower discharge flow are in a balanced state, and increasing the opening amount of the connection control valve by stopping the opening amount adjustment of the pressure control valve and increasing the opening amount of the connection control valve so as to increase the lower discharge flow of the RCV system and increase the upper charging flow and the upper charging fluid temperature.
Step S81, if the downward flow of the RCV system rises to a third preset flow, stopping the opening adjustment of the connection control valve, and reducing the upward charging flow of the RCV system;
wherein the third preset flow rate is 28.5m3And h, when the lower discharge flow of the RCV system is judged to be increased to a third preset flow, judging that the current lower discharge flow is in a standard flow state, namely the current lower discharge flow state meets the requirement of a pressure stabilizer for establishing a steam cavity, and regulating the upper charge flow to a corresponding standard flow state by reducing the upper charge flow of the RCV system.
Step S91, if the upper charging flow of the RCV system is reduced to a fourth preset flow and the water level in the voltage stabilizer reaches a preset water level, balancing the upper charging flow and the lower discharging flow of the RCV system and controlling the voltage stabilizer to execute cavity building operation;
wherein the fourth preset flow rate is 3.4m3And h, if the upper charging flow of the RCV system is reduced to a fourth preset flow, judging that the upper charging flow is in a standard flow state at the moment, namely the current upper charging flow state meets the requirement of the pressure stabilizer for establishing a steam cavity, and executing the cavity establishing operation of the pressure stabilizer.
In this embodiment, after the connection control valve is closed, the opening amount of the pressure control valve in the RCV system is reduced, so as to reduce the pressure drop rate of the lower bleed flow rate and the lower bleed orifice plate of the RCV system, and further reduce the rise rate of the lower bleed flow rate in a transient time interval, so that the rise rate of the upper bleed flow rate caused by the water level balance of the pressure stabilizer is smaller, and further reduce the temperature rise rate and the amplitude of the upper bleed flow rate, and prevent the temperature amplitude of the upper bleed flow rate from exceeding 107 ℃, so that the active control effect on severe transient is effectively achieved, the service life of the nuclear power unit is prolonged, and the lower bleed flow rate is increased to the third preset flow rate, and the upper bleed rate is reduced to the fourth preset flow rate, so that the lower bleed rate and the upper bleed rate meet the flow rate state of the pressure stabilizer building cavity, and the stability of building of the air cavity is ensured.
EXAMPLE III
Corresponding to the nuclear power generating unit voltage stabilizer cavity building control method described in the foregoing embodiment, fig. 4 shows a schematic structural diagram of a nuclear power generating unit voltage stabilizer cavity building control device 100 provided in the third embodiment of the present application, and for convenience of description, only the parts related to the embodiment of the present application are shown.
Referring to fig. 4, the apparatus includes: the system comprises a cavity building triggering module 10, a first valve adjusting module 11, a lower leakage flow detection module 12, a second valve adjusting module 13, a water level balance control module 14, a third valve adjusting module 15, an upper charging flow control module 16 and a cavity building control module 17, wherein:
and the cavity building triggering module 10 is used for acquiring the operation information of the voltage stabilizer, and if the operation information meets the cavity building triggering condition, controlling the upper charging flow of the RCV system to be maintained within a preset flow range, and increasing the lower discharging flow of the RCV system.
Wherein the cavity creation triggering module 10 is further configured to: and if the voltage stabilizer is continuously in a preset temperature range under the control of the pressure control valve within a preset time, judging that the operation information meets the cavity building triggering condition.
And the first valve adjusting module 11 is used for acquiring the measured pressure at the downstream of the lower drain hole plate and adjusting the opening of the pressure control valve according to the measured pressure.
And the lower leakage flow detection module 12 is configured to close a connection control valve between the RCV system and the RRA system, and obtain a lower leakage flow of the RCV system.
And a second valve adjusting module 13, configured to decrease the opening amount of the pressure control valve if the downward flow rate of the RCV system decreases to a first preset flow rate, so as to decrease the downward flow rate of the RCV system, so that the rising rate of the downward flow rate within a transient time interval decreases.
A water level balance control module 14, configured to continuously control the voltage stabilizer to maintain the upper charging flow of the RCV system within the preset flow range, where the preset flow range is 6 to 7m3/h。
And the third valve adjusting module 15 is configured to stop the adjustment of the opening amount of the pressure control valve and increase the opening amount of the connection control valve to increase the drain flow of the RCV system if the drain flow of the RCV system decreases to a second preset flow.
And the upper charging flow control module 16 is configured to balance the upper charging flow and the lower discharging flow of the RCV system and control the voltage stabilizer to perform a cavity building operation if the upper charging flow of the RCV system is reduced to a fourth preset flow and the water level in the voltage stabilizer reaches a preset water level, where the preset water level is-4 meters.
And the cavity building control module 17 is used for balancing the upper charging flow and the lower discharging flow of the RCV system if the upper charging flow of the RCV system is reduced to a fourth preset flow and the water level in the voltage stabilizer reaches a preset water level, and controlling the voltage stabilizer to execute the cavity building operation.
Further, the cavity control device 100 for building the voltage stabilizer of the nuclear power generating unit further includes:
a pressure monitoring module 18 for determining whether the measured pressure is less than a pressure threshold;
and when the measured pressure is judged to be smaller than the pressure threshold, sending a low-pressure prompt aiming at the lower vent plate, wherein the pressure threshold is 10 bar.
And the pressure stabilizing control module 19 is used for monitoring the pressure value of the RCP system and controlling the pressure value of the RCP system to be maintained within a preset pressure range.
In this embodiment, after the connection control valve is closed, the opening amount of the pressure control valve in the RCV system is reduced, so as to reduce the pressure drop rate of the lower bleed flow rate and the lower bleed orifice plate of the RCV system, and further reduce the rise rate of the lower bleed flow rate in a transient time interval, so that the rise rate of the upper bleed flow rate caused by the water level balance of the pressure stabilizer is smaller, and further reduce the temperature rise rate and the amplitude of the upper bleed flow rate, and prevent the temperature amplitude of the upper bleed flow rate from exceeding 107 ℃, so that the active control effect on severe transient is effectively achieved, the service life of the nuclear power unit is prolonged, and the lower bleed flow rate is increased to the third preset flow rate, and the upper bleed rate is reduced to the fourth preset flow rate, so that the lower bleed rate and the upper bleed rate meet the flow rate state of the pressure stabilizer building cavity, and the stability of building of the air cavity is ensured.
It should be noted that, for the information interaction, execution process, and other contents between the above-mentioned devices/modules, the specific functions and technical effects thereof are based on the same concept as those of the embodiment of the method of the present application, and reference may be made to the part of the embodiment of the method specifically, and details are not described here.
Fig. 5 is a schematic structural diagram of a terminal device 2 according to a fourth embodiment of the present application. As shown in fig. 5, the terminal device 2 of this embodiment includes: at least one processor 20 (only one processor is shown in fig. 5), a memory 21, and a computer program 22 stored in the memory 21 and executable on the at least one processor 20, the steps of any of the various method embodiments described above being implemented when the computer program 22 is executed by the processor 20.
The terminal device 2 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor 20, a memory 21. Those skilled in the art will appreciate that fig. 5 is only an example of the terminal device 2, and does not constitute a limitation to the terminal device 2, and may include more or less components than those shown, or combine some components, or different components, such as an input-output device, a network access device, and the like.
The Processor 20 may be a Central Processing Unit (CPU), and the Processor 20 may be other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 21 may in some embodiments be an internal storage unit of the terminal device 2, such as a hard disk or a memory of the terminal device 2. The memory 21 may also be an external storage device of the terminal device 2 in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 2. Further, the memory 21 may include both an internal storage unit and an external storage device of the terminal device 2. The memory 21 is used for storing an operating system, an application program, a BootLoader (BootLoader), data, and other programs, such as program codes of the computer program. The memory 21 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
An embodiment of the present application further provides a network device, where the network device includes: at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor, the processor implementing the steps of any of the various method embodiments described above when executing the computer program.
The embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps in the above-mentioned method embodiments.
The embodiments of the present application provide a computer program product, which when running on a mobile terminal, enables the mobile terminal to implement the steps in the above method embodiments when executed.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium and can implement the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include at least: any entity or device capable of carrying computer program code to a photographing apparatus/terminal apparatus, a recording medium, computer Memory, Read-Only Memory (ROM), random-access Memory (RAM), an electrical carrier signal, a telecommunications signal, and a software distribution medium. Such as a usb-disk, a removable hard disk, a magnetic or optical disk, etc. In certain jurisdictions, computer-readable media may not be an electrical carrier signal or a telecommunications signal in accordance with legislative and patent practice.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/network device and method may be implemented in other ways. For example, the above-described apparatus/network device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A nuclear power unit voltage stabilizer cavity building control method is characterized by comprising the following steps:
acquiring operation information of the voltage stabilizer, and if the operation information meets a cavity building triggering condition, controlling the upper charging flow of the RCV system to be maintained within a preset flow range, and increasing the lower discharging flow of the RCV system;
acquiring the measured pressure at the downstream of the lower drain hole plate, and adjusting the opening of the pressure control valve according to the measured pressure;
closing a connection control valve between the RCV system and the RRA system, and acquiring the downward discharge flow of the RCV system;
if the downward flow of the RCV system is reduced to a first preset flow, reducing the opening amount of the pressure control valve to reduce the downward flow of the RCV system, so that the rising rate of the downward flow in a transient time interval is reduced;
continuously controlling the voltage stabilizer to keep the upper charging flow of the RCV system within the preset flow range;
if the downward discharge flow of the RCV system is reduced to a second preset flow, stopping the adjustment of the opening amount of the pressure control valve, and increasing the opening amount of the connection control valve to increase the downward discharge flow of the RCV system;
if the downward discharge flow of the RCV system rises to a third preset flow, stopping the opening adjustment of the connection control valve, and reducing the upward charging flow of the RCV system;
and if the upper charging flow of the RCV system is reduced to a fourth preset flow and the water level in the voltage stabilizer reaches a preset water level, balancing the upper charging flow and the lower discharging flow of the RCV system and controlling the voltage stabilizer to execute cavity building operation.
2. The nuclear power generating unit voltage regulator cavity building control method of claim 1, wherein after the step of obtaining operating information of the voltage regulator, the method further comprises:
and if the voltage stabilizer is continuously in a preset temperature range under the control of the pressure control valve within a preset time, judging that the operation information meets the cavity building triggering condition.
3. The nuclear power generating unit voltage regulator cavity building control method of claim 1, wherein after the step of adjusting the opening of the pressure control valve based on the measured pressure, the method further comprises:
judging whether the measured pressure is smaller than a pressure threshold value;
and when the measured pressure is judged to be smaller than the pressure threshold value, sending a low-pressure prompt aiming at the lower vent plate.
4. The nuclear power generating unit voltage regulator cavity building control method of claim 1, wherein after the step of increasing a bleed down flow of the RCV system, the method further comprises:
and monitoring the pressure value of the RCP system, and controlling the pressure value of the RCP system to be maintained within a preset pressure range.
5. The nuclear power generating unit voltage stabilizer cavity building control method of claim 1, wherein the preset flow range is 6-7 m3H, the first preset flow is 11m3H, the second preset flow is 5m3H, the third preset flow is 28.5m3H, the fourth preset flow is 3.4m3/h。
6. The nuclear power generating unit voltage stabilizer cavity building control method as claimed in claim 3, characterized in that the pressure threshold is 10 bar, and the preset water level is-4 m.
7. The utility model provides a nuclear power generating set stabiliser builds chamber controlling means which characterized in that includes:
the cavity building triggering module is used for acquiring the operation information of the voltage stabilizer, controlling the upper charging flow of the RCV system to be maintained within a preset flow range and increasing the lower discharging flow of the RCV system if the operation information meets the cavity building triggering condition;
the first valve adjusting module is used for acquiring the measured pressure at the downstream of the lower drain hole plate and adjusting the opening of the pressure control valve according to the measured pressure;
the lower leakage flow detection module is used for closing a connection control valve between the RCV system and the RRA system and acquiring the lower leakage flow of the RCV system;
a second valve adjustment module for decreasing the opening amount of the pressure control valve to decrease the letdown flow of the RCV system if the letdown flow of the RCV system decreases to a first preset flow, so that the rate of increase of the letdown flow within a transient time interval decreases;
the water level balance control module is used for continuously controlling the voltage stabilizer to keep the upper charging flow of the RCV system within the preset flow range;
the third valve adjusting module is used for stopping the adjustment of the opening amount of the pressure control valve and increasing the opening amount of the connection control valve to increase the downward discharge flow of the RCV system if the downward discharge flow of the RCV system is reduced to a second preset flow;
the upper charging flow control module is used for stopping the opening adjustment of the connection control valve and reducing the upper charging flow of the RCV system if the lower discharging flow of the RCV system rises to a third preset flow;
and the cavity building control module is used for balancing the upper charging flow and the lower discharging flow of the RCV system if the upper charging flow of the RCV system is reduced to a fourth preset flow and the water level in the voltage stabilizer reaches a preset water level, and controlling the voltage stabilizer to execute the cavity building operation.
8. The nuclear power generating unit voltage stabilizer cavity building control device of claim 7, wherein the cavity building triggering module is further configured to:
and if the voltage stabilizer is continuously in a preset temperature range under the control of the pressure control valve within a preset time, judging that the operation information meets the cavity building triggering condition.
9. The nuclear power unit voltage stabilizer cavity building control device as claimed in claim 7, further comprising:
the pressure monitoring module is used for judging whether the measured pressure is smaller than a pressure threshold value;
and when the measured pressure is judged to be smaller than the pressure threshold value, sending a low-pressure prompt aiming at the lower vent plate.
10. The nuclear power unit voltage stabilizer cavity building control device as claimed in claim 7, further comprising:
and the pressure stabilizing control module is used for monitoring the pressure value of the RCP system and controlling the pressure value of the RCP system to be maintained within a preset pressure range.
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