CN111290443B - Continuous spraying flow control system of nuclear power station voltage stabilizer - Google Patents
Continuous spraying flow control system of nuclear power station voltage stabilizer Download PDFInfo
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- CN111290443B CN111290443B CN202010254140.7A CN202010254140A CN111290443B CN 111290443 B CN111290443 B CN 111290443B CN 202010254140 A CN202010254140 A CN 202010254140A CN 111290443 B CN111290443 B CN 111290443B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
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- 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
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/028—Controlling a pressure difference
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
Abstract
The invention discloses a continuous spraying flow control system of a nuclear power station voltage stabilizer, which cancels a stop block used for realizing minimum continuous spraying flow in a spraying valve, sets a continuous spraying opening signal used for generating the minimum continuous spraying flow for the spraying valve, ensures that the valve has a minimum opening for continuous spraying on the basis of an opening automatic control signal, keeps the valve at the minimum continuous spraying flow when the automatic control signal is less than the continuous spraying opening signal, opens the valve according to the automatic control signal when the automatic control signal is greater than the continuous spraying opening signal, and controls the opening of the valve by a polarization operation opening signal if the polarization operation opening signal is greater than the automatic control signal when polarization operation is started. The continuous spraying flow control system of the nuclear power station voltage stabilizer sets the minimum continuous spraying flow through the electric signal, and the whole process is safer, more reliable and more convenient.
Description
Technical Field
The invention relates to the technical field of industrial automatic control, in particular to a continuous spraying flow control system of a nuclear power station voltage stabilizer.
Background
The reactor core cooling system of the nuclear power plant is designed with a voltage stabilizer, the reactor core cooling system is also called a primary loop of a nuclear power plant unit, the primary function of the voltage stabilizer is to cool the reactor core and transfer the heat of the reactor core to a secondary loop through an evaporator, and the primary function of the voltage stabilizer is to control the pressure stability of the primary loop.
When the unit is in steady-state operation, in order to prevent the core coolant from vaporizing, under the conditions of normal power change and medium and small accident, the pressure stabilizer controls the pressure change of the RCP system (the reactor core cooling system) within an allowable range so as to ensure the safety of the reactor and avoid emergency shutdown.
Under rated power, the lower part of the voltage stabilizer is saturated water, the upper part of the voltage stabilizer is saturated steam, the bottom (liquid area) of the voltage stabilizer is connected with the heat pipe section of one loop of the RCP system through a surge pipe, and because the RCP system is a system filled with water except the voltage stabilizer, the pressure of the voltage stabilizer is transferred to the whole system.
In a steady state operation of the pressurizer, the liquid and vapor phases are in equilibrium, saturated water and saturated steam respectively, so that the temperature of the steam and water in the pressurizer is equal to the saturation temperature of the water at that pressure. The pressure of the pressurizer is equal to the pressure of the primary circuit, while the temperature of the primary circuit is lower than the saturation temperature and thus lower than the temperature inside the pressurizer.
At RCP system operating pressure (15.5 MPa), the density of water is 6 times the density of steam, so when the pressurizer electric heater heats water to produce steam, a 6-fold increase in volume will occur, so the steam pressure will necessarily increase, raising the pressurizer pressure, whereas if the steam is condensed by spray water from the cold leg, its density will decrease, lowering the pressure.
In summary, if the water in the pressurizer is heated by the electric heater, the water will vaporize and the pressure will increase, and if the coolant from the loop with a lower temperature is sprayed from above the pressurizer, the steam will partially condense and the pressure will drop, which is the principle of regulating the pressure in the pressurizer by the electric heater and the sprayer.
The pressure of the pressure stabilizer is controlled by the spraying valve and the electric heater together. Fig. 1 is a schematic structural composition diagram of a pressure control system of a voltage stabilizer according to the prior art, which comprises a voltage stabilizer 10, a heater 11, a heater control unit 12, a spraying system 13, an instrument cluster 14 and a safety valve cluster 15.
Wherein, spray system 13 comprises two pipelines that are connected to two cold tube sections respectively, and spray line upper reaches connect on RCP system 1, 2 number loop main pump's export trunk line, and two branch pipes link into a public main pipe that sprays before the stabiliser, and spray water pours into the steam space of stabiliser 10 into through the nozzle 13b that is located the stabiliser top under the drive of main pump export pressure head 13a, and 1 spray valve (001/002 VP) is respectively installed to every spray line, realizes spraying flow control through controlling its aperture.
The spray valve 001/002VP is provided with a lower baffle block, when the opening degree of the spray valve is 0, the lower baffle block enables the valve to be slightly opened and not to be completely closed, a continuous spray flow channel is formed, and the minimum continuous spray flow is generated. The continuous spraying has the functions that: limiting thermal shock of the main spray opening type to the pipeline and the valve; the uniformity of the water temperature in the voltage stabilizer is ensured; the boron concentration and the chemical additive concentration of the water in the voltage stabilizer and the loop are consistent; each pipeline is provided with a temperature detector for monitoring whether the spraying flow exists or not.
The inventor finds the following problems in the prior art in the process of implementing the invention: the valve needs to be verified in each overhaul, the valve stop block dismounting work needs to be executed, so that the verification work flow is long, the spray valve needs to be verified in each overhaul period, the minimum continuous spray flow stop block of the valve needs to be dismounted in the verification process, the stop block needs to be reinstalled after the verification is completed, the position of the stop block deviates and is difficult to restore to the original position, mechanical personnel easily cause the opening degree of the valve to be increased due to over-tightening of a clamp and insufficient opening degree of the valve due to too loose when the mechanical personnel fix the valve on site after the test opening degree is determined, so that the stop block is fixed and failed, and multiple tests and operations are easily caused; after each overhaul, the test is required to be executed again to set the minimum position of the stop block and adjust the position of the limit switch, and each test needs a lot of time, consumes the time of a key path of the unit and influences the generating capacity of the unit; in the operation process, in the valve opening and closing process, the stop block is easy to loosen and break, the valve rod and the stop block are easy to damage due to frequent impact between the valve and the stop block, and if the stop block fails in daily period, the stop block needs to enter an island for processing or needs to be temporarily stopped for processing, so that the safety of personnel and the stable operation of the unit are not facilitated, and the generated energy of the unit is influenced; the temperature of the two spraying pipelines is inconsistent due to inconsistent spraying flow, and the temperature difference of the two spraying pipelines is overlarge, so that frequent thermal shock is generated at the junction of the spraying pipelines, and the pipelines are subjected to thermal stress; the continuous spraying flow opening is reduced due to the loosening of the stop block during daily operation, and the thermal shock and the thermal stress on the spraying nozzle and the voltage stabilizer when the valve is automatically opened are increased.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a continuous spraying flow control system of a nuclear power station voltage stabilizer, which cancels a stop block, sets the minimum continuous spraying flow through an electric signal and is safer, more reliable and more convenient in the whole process.
In order to achieve the above object, the present invention provides a continuous spray flow control system for a nuclear power plant voltage stabilizer, comprising: the device comprises a pressure measuring module, a differential pressure control signal generating module, a first manual control signal setting module, a first gating module, a first automatic opening signal generating module, a polarization operation opening signal generating module, a first large-size selecting module, a second manual control signal setting module, a second gating module, a first continuous spraying opening signal setting module, a second large-size selecting module, a first valve driving module and a first spraying valve.
The pressure measurement module is used for measuring the pressure value of the pressure stabilizer. And the differential pressure control signal generation module is connected with the pressure measurement module and used for comparing the pressure measurement value of the voltage stabilizer with a pressure set value and outputting a differential pressure control signal after PID operation. The first manual control signal setting module is used for setting a first manual control signal. The first gating module is coupled with the differential pressure control signal generation module and the first manual control signal setting module, and is used for outputting the first manual control signal when receiving the first manual control signal and outputting the differential pressure control signal when not receiving the first manual control signal. The first automatic opening degree signal generating module is coupled with the first gating module and used for linearly converting the output signal of the first gating module into a first automatic opening degree signal. The polarization operation opening degree signal generation module is used for generating a polarization operation opening degree signal. The first large selection module is coupled with the first automatic opening signal generation module and the polarization operation opening signal generation module, and is used for comparing the first automatic opening signal with the polarization operation opening signal and outputting a signal with a larger value. The second manual control signal setting module is used for setting a second manual control signal. The second gating module is coupled with the first large-selection module and the second manual control signal setting module, and is used for outputting the second manual control signal when receiving the second manual control signal, and outputting the output signal of the first large-selection module when not receiving the second manual control signal. The first continuous spraying opening degree signal setting module is used for setting a first continuous spraying opening degree signal. The second large selection module is coupled with the second gating module and the first continuous spraying opening degree signal setting module, and is used for comparing the output signal of the second gating module with the first continuous spraying opening degree signal and outputting a signal with a larger value. The first valve driving module is coupled with the second large selection module and used for generating a driving signal according to an output signal of the second large selection module. The first spraying valve is coupled with the first valve driving module, a stop block used for realizing minimum continuous spraying flow is not arranged in the first spraying valve, and the first spraying valve is used for forming corresponding opening after receiving a driving signal output by the first valve driving module. When the signal output by the second large selection module is the first continuous spraying opening degree signal, the first valve driving module generates a minimum driving signal to enable the first spraying valve to form a minimum opening degree.
In one embodiment of the present invention, the differential pressure control signal generation module includes: an average value operation unit and a PID operation unit. The average value operation unit is coupled with the pressure measurement module and used for collecting a plurality of measurement values of the pressure measurement module and obtaining an average value of the plurality of measurement values. And the PID operation unit is coupled with the average value operation unit and used for comparing the average value with the pressure set value and generating the differential pressure control signal through PID operation.
In an embodiment of the present invention, the continuous spray flow control system of the nuclear power plant voltage stabilizer further includes: the automatic opening degree control system comprises a second automatic opening degree signal generating module, a third large selection module, a third manual control signal setting module, a third gating module, a second continuous spraying opening degree signal setting module, a fourth large selection module, a second valve driving module and a second spraying valve.
And the second automatic opening degree signal generation module is coupled with the first gating module and used for linearly converting the output signal of the first gating module into a second automatic opening degree signal. The third maximum selection module is coupled with the second automatic opening signal generation module and the polarization operation opening signal generation module, and is configured to compare the second automatic opening signal with the polarization operation opening signal, and output a signal with a larger value. The third manual control signal setting module is used for setting a third manual control signal. The third gating module is coupled with the third large selection module and the third manual control signal setting module, and is configured to output the third manual control signal when receiving the third manual control signal, and output an output signal of the third large selection module when not receiving the third manual control signal. The second continuous spraying opening degree signal setting module is used for setting a second continuous spraying opening degree signal. And the fourth large selection module is coupled with the third gating module and the second continuous spraying opening degree signal setting module and is used for comparing the output signal of the third gating module with the second continuous spraying opening degree signal and outputting a signal with a larger value. And the second valve driving module is coupled with the fourth large selection module and used for generating a driving signal according to the output signal of the fourth large selection module. And the second spraying valve is coupled with the second valve driving module, a stop block for realizing minimum continuous spraying flow is not arranged in the second spraying valve, and the second spraying valve is used for forming corresponding opening after receiving a driving signal output by the second valve driving module. When the signal output by the fourth large selection module is the second continuous spraying opening degree signal, the second valve driving module generates a minimum driving signal to enable the second spraying valve to form a minimum opening degree.
In an embodiment of the present invention, the continuous spray flow control system of the nuclear power plant voltage stabilizer further includes: the device comprises a first proportional heater, a first function generation module, a second proportional heater and a second function generation module. The first proportional heater is used for heating the voltage stabilizer. The first function generation module is coupled to the first gating module and is configured to linearly convert an output signal of the first gating module into a power signal of the first proportional heater. And the second proportional heater is used for heating the voltage stabilizer. And the second function generation module is coupled with the first gating module and used for linearly converting the output signal of the first gating module into a power signal of the second proportional heater.
In an embodiment of the present invention, the continuous spray flow control system of the nuclear power plant voltage stabilizer further includes: and the pressure early warning module is coupled with the pressure measuring module and used for comparing the pressure measuring value of the pressure measuring module with a threshold value and generating a safety control and alarm signal if the pressure measuring value exceeds the threshold value range.
In an embodiment of the present invention, the continuous spray flow control system of the nuclear power plant voltage stabilizer further includes: and the differential pressure early warning module is coupled with the first gating module and is used for comparing the output signal value of the first gating module with a threshold value and generating a safety control and alarm signal if the output signal value exceeds the threshold value range.
In one embodiment of the present invention, the value of the first continuous spray opening degree signal and the value of the second continuous spray opening degree signal are set by a system test, and the system test includes: the closing limit of the first spraying valve and the second spraying valve is released to the lowest position under the condition that the system is stable and various parameters are normal; setting both the first proportional heater and the second proportional heater in an automatic control state; monitoring a deviation between a temperature of a pipeline in communication with the first spray valve and a temperature of a pipeline in communication with the second spray valve; monitoring the output value of the first manual control signal setting module; adjusting the opening degrees of the first spray valve and the second spray valve in a manual control mode to keep the power of the first proportional heater and the power of the second proportional heater at 50%, controlling the output signal value of the first manual control signal setting module to be-0.1165 bar, controlling the deviation between the temperatures to be within a range of 5 ℃, ensuring that the temperature of a spray pipeline exceeds 260 ℃, ensuring that the temperature of a fluctuation pipeline exceeds 300 ℃, and ensuring that the continuous spray flow of the first spray valve and the second spray valve is more than 230L/h; monitoring for a certain time when the power of the first proportional heater and the second proportional heater is stabilized at 50% and the deviation between the temperatures is maintained at ± 1 ℃; when various system parameters are still stable within the monitoring time, recording the current value of the second manual control signal and the current value of the third manual control signal; setting a value of the first continuous spray opening degree signal as a value of the second manual control signal, and setting a value of the second continuous spray opening degree signal as a value of the third manual control signal.
In an embodiment of the present invention, the system test process further includes: after the values of the first continuous spraying opening degree signal and the second continuous spraying opening degree signal are set, the positions of limit switches of the first spraying valve and the second spraying valve are adjusted to ensure that the limit closing can be normally triggered.
In one embodiment of the invention, the temperature of the spray line was ensured to be 285 ℃ during the system test.
Compared with the prior art, according to the continuous spraying flow control system of the nuclear power station voltage stabilizer, provided by the invention, a continuous spraying opening signal is set, the minimum continuous spraying flow of the valve can be completed in an automatic control mode, a field valve stop block is not required to be arranged, a mechanical professional is not required to disassemble and connect the field valve stop block, the problem that the minimum spraying position is deviated is avoided, and time delay is avoided; the problem that the actual opening degree and the set opening degree have deviation does not exist in the setting process, and a large amount of time of the key path of the unit power generation can be saved; because the stop block does not exist, the problems that the stop block is easy to loosen, break and the like in the valve opening and closing process do not exist in the operation process; frequent impact between the stop block and the valve is avoided, and the safety of the valve is protected; the failure of a stop block in the operation period of the daily unit is avoided, the stop block needs to enter an island for processing, or the unit needs to be stopped for processing, the working risk of personnel is greatly reduced, the safety of the personnel and the stable operation of the unit are ensured, and the generating capacity of the unit is improved; the problem of overlarge temperature difference of the two spraying pipelines is solved, and the pipelines are prevented from being subjected to thermal stress due to frequent thermal shock generated at the junction of the spraying pipelines.
Drawings
FIG. 1 is a schematic diagram of the structural components of a pressure control system for a pressure regulator according to the prior art;
FIG. 2 is a structural component of a continuous spray flow control system of a nuclear power plant potentiostat according to an embodiment of the invention;
fig. 3 is a method for setting a test of a continuous shower opening degree signal according to an embodiment of the present invention.
Detailed description of the preferred embodiments
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
In order to overcome the problems of the prior art, the invention provides a continuous spraying flow control system of a nuclear power station voltage stabilizer, which cancels a stop block used for realizing minimum continuous spraying flow in a spraying valve, sets a continuous spraying opening signal used for generating the minimum continuous spraying flow for the spraying valve, ensures that the valve has the minimum opening for continuous spraying on the basis of an automatic opening control signal, when the automatic control signal is smaller than the continuous spraying opening signal, the valve is kept at the minimum continuous spraying flow, when the automatic control signal is larger than the continuous spraying opening signal, the valve is opened according to the automatic control signal, when polarization operation is put in, if the polarization operation opening signal is larger than the automatic control signal, the opening of the valve is controlled by the polarization operation opening signal, and when the polarization operation opening signal is smaller than the automatic control signal, the opening of the valve is controlled by the automatic control signal.
As shown in fig. 2, in one embodiment, a continuous spray flow control system for a nuclear power plant potentiostat includes: the device comprises a pressure measuring module 200, a differential pressure control signal generating module 201, a first manual control signal setting module 202, a first gating module 203, a first automatic opening signal generating module 204, a polarization operation opening signal generating module 205, a first big-selection module 206, a second manual control signal setting module 207, a second gating module 208, a first continuous spraying opening signal setting module 209, a second big-selection module 210, a first valve driving module 211, a first spraying valve 212, a second automatic opening signal generating module 213, a third big-selection module 214, a third manual control signal setting module 215, a third gating module 216, a second continuous spraying opening signal setting module 217, a fourth big-selection module 218, a second valve driving module 219 and a second spraying valve 220.
The pressure measurement module 200 is used for measuring the pressure value of the pressure stabilizer.
And a differential pressure control signal generation module 201, configured to compare a pressure measurement value of the voltage regulator with a pressure set value, and output a differential pressure control signal after PID operation.
In this embodiment, in order to obtain a relatively accurate differential pressure control signal, a plurality of differential pressure transmitters are provided in the pressure measurement module 200, and a pressure value of the pressure stabilizer is collected at the same time, and an average value operation unit is provided in the differential pressure control signal generation module 201, and is configured to calculate an average value of the plurality of measurement values. And the PID operation unit is used for comparing the average value with the pressure set value and generating the differential pressure control signal through PID operation.
The first manual control signal setting module 202 is configured to set the first manual control signal, and may be configured in a software or hardware manner.
The first gating module 203 is coupled to the differential pressure control signal generating module 201 and the first manual control signal setting module 202, and is configured to output the first manual control signal when receiving the first manual control signal, and output the differential pressure control signal when not receiving the first manual control signal.
The first automatic opening degree signal generating module 204 is coupled to the first gating module 203, and is configured to linearly convert the output signal of the first gating module 203 into a first automatic opening degree signal. There is a linear relationship between the two signals. And when the output differential pressure signal reaches 1.7 to 5.2bar, correspondingly controlling the opening of the valve to be 0 to 100 percent, and using the control valve for cooling the voltage stabilizer to reduce the pressure of a loop.
The polarization operation opening signal generation module 205 is configured to generate a polarization operation opening signal.
The first selection module 206 is coupled to the first automatic opening signal generation module 204 and the polarization operation opening signal generation module 205, and configured to compare the first automatic opening signal with the polarization operation opening signal and output a signal with a larger value.
The second manual control signal setting module 207 is used for setting a second manual control signal.
The second gating module 208 is coupled to both the first large-selection module 206 and the second manual control signal setting module 207, and configured to output the second manual control signal when the second manual control signal is received, and output the output signal of the first large-selection module 206 when the second manual control signal is not received.
And a first continuous spraying opening degree signal setting module 209, configured to set a first continuous spraying opening degree signal.
The second maximum selection module 210 is coupled to both the second gating module 208 and the first continuous spraying opening degree signal setting module 209, and is configured to compare the output signal of the second gating module 208 with the first continuous spraying opening degree signal, and output a signal with a larger value.
The first valve driving module 211 is coupled to the second large selection module 210, and is configured to generate a driving signal according to an output signal of the second large selection module 210.
The first spray valve 212 is coupled to the first valve driving module 211, a stop block for realizing a minimum continuous spray flow is not arranged in the first spray valve 212, and the first spray valve 212 is configured to form a corresponding opening degree after receiving a driving signal output by the first valve driving module 211. When the signal output by the second maximum selection module 210 is the first continuous spraying opening degree signal, the first valve driving module 211 generates a minimum driving signal to enable the first spraying valve 212 to form a minimum opening degree. In this embodiment, after the polarization operation opening degree signal is finally connected to the first valve driving module 211, the first spraying valve 212 can generate an opening degree of 22%.
The second automatic opening signal generating module 213 is coupled to the first gating module 203, and is configured to linearly convert the output signal of the first gating module 203 into a second automatic opening signal. The two signals are in a linear relation, when the output differential pressure signal reaches 1.7 to 5.2bar, the opening of the corresponding control valve is 0 to 100 percent, and the control valve is used for cooling the voltage stabilizer and reducing the pressure of a loop.
The third maximum selection module 214 is coupled to the second automatic opening signal generation module 213 and the polarization operation opening signal generation module 205, and configured to compare the second automatic opening signal with the polarization operation opening signal and output a signal with a larger value.
The third manual control signal setting module 215 is configured to set the third manual control signal.
The third gating module 216 is coupled to both the third macro selection module 214 and the third manual control signal setting module 215, and is configured to output the third manual control signal when the third manual control signal is received, and output the output signal of the third macro selection module 214 when the third manual control signal is not received.
The second continuous spraying opening degree signal setting module 217 is configured to set a second continuous spraying opening degree signal.
The fourth gating module 218 is coupled to the third gating module 216 and the second continuous spraying opening degree signal setting module 217, and configured to compare the output signal of the third gating module 216 with the second continuous spraying opening degree signal, and output a signal with a larger value.
A second valve driver module 219 is coupled to the fourth selection module 218 for generating a driving signal according to an output signal of the fourth selection module 218.
The second spraying valve 220 is coupled to the second valve driving module 219, a block for realizing a minimum continuous spraying flow rate is not disposed in the second spraying valve 220, and the second spraying valve 220 is configured to form a corresponding opening degree after receiving a driving signal output by the second valve driving module 219. When the signal output by the fourth maximum selection module 218 is the second continuous spray opening degree signal, the second valve driving module 219 generates a minimum driving signal such that the second spray valve 220 forms a minimum opening degree. In this embodiment, after the polarization operation opening degree signal is finally connected to the second valve driving module 219, the second spray valve 220 can generate an opening degree of 22%.
In one embodiment, the continuous spray flow control system of the nuclear power plant voltage stabilizer further comprises: the system comprises a first proportional heater 221, a first function generation module 222, a second proportional heater 223 and a second function generation module 224.
The first proportional heater 221 is used to heat the regulator to increase the loop pressure. The first function generating module 222 is coupled to the first gating module 203, and is configured to linearly convert the output signal of the first gating module 203 into a power signal of the first proportional heater 221. When the differential pressure signal output by the first gating module 203 reaches-1 to 1bar, the power value of the first proportional heater 221 is correspondingly controlled to be 100-0% for heating the voltage stabilizer, and the pressure of a primary loop is increased.
A second proportional heater 223 is used to heat the potentiostat. The second function generation module 224 is coupled to the first gating module 203, and is configured to linearly convert the output signal of the first gating module 203 into a power signal of the second proportional heater 223. When the differential pressure signal output by the first gating module 203 reaches-1 to 1bar, the power value of the second proportional heater 223 is correspondingly controlled to be 100-0% for heating the voltage stabilizer, and the pressure of a loop is increased.
In one embodiment, the system for controlling the flow rate of continuous spraying of the pressurizer of the nuclear power plant further comprises: a pressure warning module 225.
The pressure early warning module 225 is coupled to the pressure measurement module 200, and a comparator is disposed inside the pressure early warning module for comparing the pressure measurement value of the pressure measurement module 200 with a threshold value, and generating a safety control and alarm signal if the pressure measurement value exceeds the threshold value. Specifically, when the pressure pre-warning module 225 detects that the pressure is less than 160bar, a signal for closing the pressurizer release pipe scavenging valve and an alarm signal are generated. When the pressure early warning module 225 detects that the pressure is less than 151bar, an alarm signal is generated. When the pressure early warning module 225 detects that the pressure is less than 148bar, a spray valve closing signal and an alarm signal are generated, and polarization operation is stopped.
In one embodiment, the continuous spray flow control system of the nuclear power plant voltage stabilizer further comprises: a differential pressure warning module 226.
The differential pressure early warning module 226 is coupled to the first gating module 203, and a comparator is provided therein, and is configured to compare the output signal value of the first gating module 203 with a threshold, and if the output signal value exceeds the threshold range, generate a safety control and alarm signal. Specifically, the comparator in the differential pressure early warning module 226 controls the on-off heater, and when the differential pressure signal is reduced to-1.7 bar, the on-off heater is started to stop the polarization operation. When the differential pressure signal reaches-1, the heater is shut down for increasing the pressure when the primary circuit pressure is low. The differential pressure early warning module 226 is further configured to generate a signal for closing a purge valve of a release pipe of the voltage stabilizer, a polarization-off operation signal, and an alarm signal when detecting that an output signal value (a compensated differential pressure value) of the first gating module 203 is greater than 6 bar.
In one embodiment, the value of the first continuous spray opening degree signal and the value of the second continuous spray opening degree signal are set by a system test, as shown in fig. 3, the system test includes: step S1 to step S9.
The off-limit is put to the lowest position in step S1. And under the condition that the system is stable and various parameters are normal, the closing limit of the first spraying valve 212 and the second spraying valve 220 is released to the lowest position. The system stabilization and the normal parameters comprise: the temperature of a loop is stable, the water level of the voltage stabilizer is stable, the auxiliary spraying is leakage-free, all parameters of the valve are normal, and the heater is controlled normally.
Both the first proportional heater 221 and the second proportional heater 223 are set in the automatic control state at step S2.
The line temperature difference is monitored in step S3. A deviation between the temperature of the line in communication with the first spray valve 212 and the temperature of the line in communication with the second spray valve 220 is monitored.
The output value of the first manual control signal setting module 202 is monitored in step S4.
In step S5, the opening of the shower valve is adjusted in the manual control mode. Adjusting the opening degrees of the first spray valve 212 and the second spray valve 220 to keep the power of the first proportional heater 221 and the power of the second proportional heater 223 at 50%, setting the output signal value of the first manual control signal setting module 202 between-0.1165 bar and 0.1165bar, controlling the deviation between the temperatures within a range of 5 ℃, ensuring that the temperature of a spray pipeline exceeds 260 ℃, ensuring that the temperature of a fluctuation pipeline exceeds 300 ℃, and ensuring that the continuous spray flow of the first spray valve 212 and the second spray valve 220 is larger than 230L/h so as to ensure that the spray nozzle maintains the minimum spray flow required by a constant thermal state working condition. Wherein, preferably, the temperature value of the spray line is ensured to be 285 ℃.
In step S6, condition monitoring is performed. When the power of the first proportional heater 221 and the second proportional heater 223 is stabilized at 50% and the deviation between the temperatures is maintained at ± 1 ℃, monitoring for a certain time, such as 30min.
In step S7 the value of the second manual control signal and the value of the third manual control signal are recorded. And recording the current values of the second manual control signal and the third manual control signal if all parameters of the system are still stable in the monitoring time.
In step S8, the values of the first continuous spray opening degree signal and the second continuous spray opening degree signal are set. Setting a value of the first continuous spray opening degree signal as a value of the second manual control signal, and setting a value of the second continuous spray opening degree signal as a value of the third manual control signal.
In step S9, the limit switch is adjusted. And adjusting the positions of limit switches of the first spray valve 212 and the second spray valve 220 to ensure that the closing limit can be normally triggered.
In summary, the continuous spray flow control system of the nuclear power plant voltage stabilizer according to the embodiment allows the control signal of the valve to be kept at the minimum opening degree by introducing a set value (continuous spray opening degree signal) for limitation, and after the minimum opening degree of the valve is set by the method, the continuous spray test process is optimized, and the system has the following advantages: a field valve stop block is cancelled, so that a mechanical professional is not required to disassemble and connect the stop block of the field valve, the problem of deviation of the minimum spraying position is solved, and time delay is avoided; the problem that the actual opening degree and the set opening degree have deviation does not exist in the setting process, if the valve instruction and the opening degree are not influenced in the valve checking process, the continuous spraying flow of the valve does not change, the experiment only needs to be verified in the unit ascending stage, and a large amount of time of the unit power generation key path can be saved; because the stop block does not exist, the problems that the stop block is easy to loosen, break and the like in the valve opening and closing process do not exist in the operation process; frequent impact between the stop block and the valve is avoided, and the safety of the valve is protected; the failure of a stop block in the operation period of the daily unit is avoided, the stop block needs to enter an island for processing, or the unit needs to be stopped for processing, the working risk of personnel is greatly reduced, the safety of the personnel and the stable operation of the unit are ensured, and the generating capacity of the unit is improved; the problem of overlarge temperature difference of the two spraying pipelines is solved, and the pipelines are prevented from being subjected to thermal stress due to frequent thermal shock generated at the junction of the spraying pipelines.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (5)
1. The utility model provides a nuclear power station stabiliser spray flow control system in succession which characterized in that includes:
the pressure measuring module is used for measuring the pressure value of the voltage stabilizer;
the differential pressure control signal generation module is connected with the pressure measurement module and used for comparing a pressure measurement value of the voltage stabilizer with a pressure set value and outputting a differential pressure control signal after PID operation;
the first manual control signal setting module is used for setting a first manual control signal;
a first gating module, coupled to both the differential pressure control signal generation module and the first manual control signal setting module, for outputting the first manual control signal when the first manual control signal is received, and outputting the differential pressure control signal when the first manual control signal is not received;
the first automatic opening signal generation module is coupled with the first gating module and used for linearly converting the output signal of the first gating module into a first automatic opening signal;
the polarization operation opening signal generation module is used for generating a polarization operation opening signal;
the first large selection module is coupled with the first automatic opening signal generation module and the polarization operation opening signal generation module, and is used for comparing the first automatic opening signal with the polarization operation opening signal and outputting a signal with a larger value;
the second manual control signal setting module is used for setting a second manual control signal;
the second gating module is coupled with the first big selection module and the second manual control signal setting module and used for outputting the second manual control signal when receiving the second manual control signal and outputting the output signal of the first big selection module when not receiving the second manual control signal;
the first continuous spraying opening degree signal setting module is used for setting a first continuous spraying opening degree signal;
the second large selection module is coupled with the second gating module and the first continuous spraying opening degree signal setting module, and is used for comparing the output signal of the second gating module with the first continuous spraying opening degree signal and outputting a signal with a larger value;
the first valve driving module is coupled with the second large selection module and used for generating a driving signal according to an output signal of the second large selection module; and
the first spraying valve is coupled with the first valve driving module, a stop block used for realizing minimum continuous spraying flow is not arranged in the first spraying valve, the first spraying valve is used for forming corresponding opening after receiving a driving signal output by the first valve driving module,
when the signal output by the second large selection module is the first continuous spraying opening degree signal, the first valve driving module generates a minimum driving signal to enable the first spraying valve to form a minimum opening degree;
the differential pressure control signal generation module includes:
the average value operation unit is coupled with the pressure measurement module and used for acquiring a plurality of measurement values of the pressure measurement module and acquiring an average value of the plurality of measurement values; and
the PID operation unit is coupled with the average value operation unit and used for comparing the average value with the pressure set value and generating the differential pressure control signal through PID operation;
the continuous spraying flow control system of the nuclear power station voltage stabilizer further comprises:
the second automatic opening degree signal generation module is coupled with the first gating module and used for linearly converting the output signal of the first gating module into a second automatic opening degree signal;
the third maximum selection module is coupled with the second automatic opening signal generation module and the polarization operation opening signal generation module, and is used for comparing the second automatic opening signal with the polarization operation opening signal and outputting a signal with a larger value;
the third manual control signal setting module is used for setting a third manual control signal;
the third gating module is coupled with the third large selection module and the third manual control signal setting module, and is used for outputting the third manual control signal when the third manual control signal is received and outputting the output signal of the third large selection module when the third manual control signal is not received;
the second continuous spraying opening degree signal setting module is used for setting a second continuous spraying opening degree signal;
the fourth large selection module is coupled with the third gating module and the second continuous spraying opening degree signal setting module, and is used for comparing the output signal of the third gating module with the second continuous spraying opening degree signal and outputting a signal with a larger value;
the second valve driving module is coupled with the fourth large selection module and used for generating a driving signal according to an output signal of the fourth large selection module; and
the second spraying valve is coupled with the second valve driving module, a stop block used for realizing minimum continuous spraying flow is not arranged in the second spraying valve, the second spraying valve is used for forming corresponding opening after receiving a driving signal output by the second valve driving module,
when the signal output by the fourth large selection module is the second continuous spraying opening degree signal, the second valve driving module generates a minimum driving signal to enable the second spraying valve to form a minimum opening degree;
the continuous spraying flow control system of the nuclear power station voltage stabilizer further comprises:
the first proportional heater is used for heating the voltage stabilizer;
the first function generation module is coupled with the first gating module and used for linearly converting the output signal of the first gating module into a power signal of the first proportional heater;
the second proportional heater is used for heating the voltage stabilizer; and
the second function generation module is coupled with the first gating module and used for linearly converting the output signal of the first gating module into a power signal of the second proportional heater;
the value of the first continuous spraying opening degree signal and the value of the second continuous spraying opening degree signal are set through a system test, and the system test process comprises the following steps:
the closing limit of the first spraying valve and the second spraying valve is released to the lowest position under the condition that the system is stable and various parameters are normal;
setting both the first proportional heater and the second proportional heater in an automatic control state;
monitoring a deviation between a temperature of a pipeline in communication with the first spray valve and a temperature of a pipeline in communication with the second spray valve;
monitoring the output value of the first manual control signal setting module;
adjusting the opening degrees of the first spray valve and the second spray valve in a manual control mode to keep the power of the first proportional heater and the power of the second proportional heater at 50%, controlling the output signal value of the first manual control signal setting module to be-0.1165 bar, controlling the deviation between the temperatures to be within a range of 5 ℃, ensuring that the temperature of a spray pipeline exceeds 260 ℃, ensuring that the temperature of a fluctuation pipeline exceeds 300 ℃, and ensuring that the continuous spray flow of the first spray valve and the second spray valve is more than 230L/h;
monitoring for a certain time when the power of the first proportional heater and the second proportional heater is stabilized at 50% and the deviation between the temperatures is maintained at ± 1 ℃;
when all system parameters are still stable in the monitoring time, recording the current value of the second manual control signal and the current value of the third manual control signal; and
setting the value of the first continuous spraying opening degree signal as the value of the second manual control signal, and setting the value of the second continuous spraying opening degree signal as the value of the third manual control signal.
2. The continuous spray flow control system for a nuclear power plant regulator as recited in claim 1, further comprising:
and the pressure early warning module is coupled with the pressure measuring module and used for comparing the pressure measuring value of the pressure measuring module with a threshold value and generating a safety control and alarm signal if the pressure measuring value exceeds the threshold value range.
3. The continuous spray flow control system for a nuclear power plant regulator as recited in claim 1, further comprising:
and the differential pressure early warning module is coupled with the first gating module and used for comparing the output signal value of the first gating module with a threshold value and generating a safety control signal and an alarm signal if the output signal value exceeds the threshold value range.
4. The continuous spray flow control system for a nuclear power plant regulator as claimed in claim 1, wherein the system test procedure further comprises:
after the values of the first continuous spraying opening degree signal and the second continuous spraying opening degree signal are set, the positions of limit switches of the first spraying valve and the second spraying valve are adjusted to ensure that the closing limit can be normally triggered.
5. The continuous spray flow control system for a nuclear power plant regulator as claimed in claim 1, wherein the temperature of the spray line is ensured to be 285 ℃.
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| CN115831403B (en) * | 2023-01-01 | 2023-09-26 | 南通曙光机电工程有限公司 | Cooling spray protection device for nuclear power station voltage stabilizer |
| CN116518140B (en) * | 2023-05-16 | 2023-11-17 | 江南阀门有限公司 | Method for improving performance of nuclear power safety double-group valve |
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