CN117095842A - Nuclear power unit system - Google Patents
Nuclear power unit system Download PDFInfo
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- CN117095842A CN117095842A CN202310596623.9A CN202310596623A CN117095842A CN 117095842 A CN117095842 A CN 117095842A CN 202310596623 A CN202310596623 A CN 202310596623A CN 117095842 A CN117095842 A CN 117095842A
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- 238000001514 detection method Methods 0.000 claims abstract description 22
- 230000008859 change Effects 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 claims description 25
- 230000001276 controlling effect Effects 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 230000003750 conditioning effect Effects 0.000 claims 1
- 230000007774 longterm Effects 0.000 abstract description 5
- 230000006870 function Effects 0.000 description 12
- 238000001914 filtration Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000033228 biological regulation Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/003—Remote inspection of vessels, e.g. pressure vessels
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- High Energy & Nuclear Physics (AREA)
- Mechanical Engineering (AREA)
- Control Of Turbines (AREA)
Abstract
The invention provides a nuclear power unit system comprising: a high-pressure cylinder; the deaerator is used for deoxidizing the condensed water entering the deaerator through the steam output by the high-pressure cylinder; a primary steam system for providing a first auxiliary steam to the deaerator; the auxiliary steam system is used for providing second auxiliary steam for the deaerator so that the deaerator can be operated under the working condition of empty load constant pressure operation; the pressure detection module is used for acquiring the pressure of the deaerator; the first-order hysteresis module is used for judging that a triggering signal is sent out when the load shedding working condition of the steam turbine of the nuclear power unit occurs according to the pressure of the deaerator; and the adjusting module is used for enabling the pressure of the deaerator to be reduced at a preset speed after the preset time of the pressure before load shedding is maintained when the trigger signal is received. The first-order inertial filter module is introduced, so that the pressure change of the deaerator can be accurately identified, the load shedding working condition of the steam turbine can be accurately detected, the pressure stability of the deaerator is ensured, and the long-term stable operation of the nuclear power unit is facilitated.
Description
Technical Field
The invention relates to the field of nuclear power units, in particular to a nuclear power unit system.
Background
In the running process of the nuclear power unit, due to the faults of an external power grid, a main machine or an auxiliary machine system, the load rapid-falling working condition of the unit, namely the load dump working condition, is unavoidable, and the load rapid-falling of the nuclear power unit often causes the pressure of the deaerator to be rapidly reduced. The pressure drop of the deaerator can lead the main water supply not to be heated continuously, and when the unit is out of order, the unit cannot be quickly restored to the original load working condition to continue to operate.
At present, complex combinations of various signals such as a turbine shutdown signal, a reactor shutdown signal, a turbine island operation and the like are commonly adopted to identify a load shedding working condition, the scheme can identify working conditions of a large-scale load shedding of certain units, but cannot accurately detect the working conditions of the load shedding of the turbine caused by the fact that the turbine shutdown is not triggered, the reactor shutdown and the rapid load shedding working conditions of other units except the turbine island operation are not accurately detected, so that the pressure stability of a deaerator under the working conditions cannot be ensured, and the long-term stable operation of a nuclear power unit is not facilitated.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a nuclear power unit system which can accurately detect the load shedding working condition of a steam turbine, ensure the pressure stability of a deaerator and is beneficial to the long-term stable operation of the nuclear power unit.
The technical scheme adopted by the invention is as follows:
the embodiment of the invention provides a nuclear power unit system, which comprises: a high-pressure cylinder; the deaerator is connected with the exhaust port of the high-pressure cylinder through a first regulating valve and is used for deaerating the condensate water entering the deaerator through the steam output by the high-pressure cylinder; the main steam system is connected with the deaerator through a second regulating valve and is used for providing first auxiliary steam for the deaerator so as to keep the deaerator pressure stable under the load-shedding working condition; the auxiliary steam system is connected with the deaerator through a third regulating valve and is used for providing second auxiliary steam for the deaerator through the third regulating valve so that the deaerator can operate under the empty load constant pressure operation condition; the pressure detection module is arranged on the deaerator and is used for acquiring the pressure of the deaerator; the first-order hysteresis module is used for judging whether the load shedding working condition occurs to the steam turbine of the nuclear power unit according to the pressure of the deaerator, and sending a trigger signal when judging that the load shedding working condition occurs to the steam turbine; and the adjusting module is used for controlling the second adjusting valve when the trigger signal is received, so that the pressure of the deaerator is maintained to be reduced at a preset speed after the preset time of the pressure before load shedding.
In addition, the nuclear power unit system provided by the invention can also have the following additional technical characteristics:
according to one embodiment of the invention, the pressure detection module comprises a first pressure transmitter, a second pressure transmitter and a third pressure transmitter, the pressure detection module being configured to: when the first pressure transmitter, the second pressure transmitter and the third pressure transmitter are all fault-free, acquiring the pressure of the deaerator according to the median value of the pressures detected by the first pressure transmitter, the second pressure transmitter and the third pressure transmitter; when any one of the first pressure transmitter, the second pressure transmitter and the third pressure transmitter fails, acquiring the pressure of the deaerator according to the average value of the pressures detected by the two pressure transmitters which do not fail; when any two pressure transmitters of the first pressure transmitter, the second pressure transmitter and the third pressure transmitter fail, the pressure of the deaerator is obtained according to the pressure detected by the pressure transmitter which does not fail; and when the first pressure transmitter, the second pressure transmitter and the third pressure transmitter all fail, acquiring the pressure of the deaerator according to the last detected effective values in the first pressure transmitter, the second pressure transmitter and the third pressure transmitter. The pressure of the deaerator can be prevented from being obtained due to the failure of a single pressure transmitter by arranging three pressure transmitters, so that the pressure of the deaerator can be continuously and stably obtained.
According to one embodiment of the invention, the transfer function of the first order hysteresis module is obtained according to the following formula:where τ is the filter time and s is the variable. The first-order hysteresis module calculates the pressure of the deaerator based on the transfer function, can well inhibit the periodic interference signal of the deaerator pressure signal, and obtains the pressure number of the deaeratorThe value is accurate, and the deaerator is suitable for occasions with higher pressure fluctuation frequency.
According to one embodiment of the invention, τ=10s. When the filtering time is set to 10s, the first-order hysteresis module can adapt to the rapid pressure change of the deaerator, the filtering result can be timely output, the sensitivity is high, and the situation that the load-shedding working condition is misidentified due to the fact that interference cannot be effectively filtered due to excessive sensitivity can be prevented.
According to one embodiment of the present invention, the first-order hysteresis module is specifically configured to: and when the pressure reduction rate of the deaerator reaches 80KPa/10s or the pressure step drops by 80KPa, judging that the load shedding working condition of the steam turbine occurs.
According to one embodiment of the invention, the adjustment module comprises: the given function generator is used for generating a pressure maintaining curve according to the pressure of the deaerator before load shedding when the trigger signal is received, and the pressure change of the pressure maintaining curve is as follows: firstly, keeping the pressure of the deaerator for 300 seconds before load shedding, and then reducing the pressure to 0 at 0.1 MPa/min; and a PID regulator (Proportion Integration Differentiation, proportional-integral-derivative regulator) for controlling the second regulating valve according to the pressure maintaining curve so that the pressure of the deaerator changes according to the pressure maintaining curve. When the load shedding working condition of the steam turbine occurs, the pressure change of the deaerator is controlled through the given function generator and the PID regulator according to the pressure maintaining curve, so that the overpressure opening of the safety valve of the auxiliary steam system due to the sudden reduction of the air consumption can be effectively avoided, and the safe operation of the deaerator is ensured.
The invention has the beneficial effects that:
according to the nuclear power unit system provided by the embodiment of the invention, the pressure detection module is used for acquiring the pressure change of the deaerator, the first-order hysteresis module is arranged for judging whether the load shedding working condition occurs to the steam turbine according to the pressure change of the deaerator, and the pressure of the deaerator is controlled to be maintained at the pressure before the load shedding for a period of time through the adjustment module during the load shedding working condition, so that the load shedding working condition of the steam turbine can be accurately detected, the pressure stability of the deaerator is ensured, and the long-term stable operation of the nuclear power unit is facilitated.
Drawings
FIG. 1 is a block schematic diagram of a nuclear power generating unit system in accordance with an embodiment of the present invention;
FIG. 2 is a block diagram of a pressure detection module according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of a pressure maintaining curve according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the nuclear power generating unit system according to the embodiment of the present invention includes a high pressure cylinder 100, a deaerator 200, a main steam system 300, an auxiliary steam system 400, a pressure detection module 500, a first-order hysteresis module 600, a regulation module 700, a first regulation valve 800, a second regulation valve 900, and a third regulation valve 1000. The deaerator 200 is connected with an exhaust port of the high-pressure cylinder 100 through a first regulating valve 800, and the deaerator 200 is used for deaerating the condensate entering the deaerator through the steam output by the high-pressure cylinder 100; the main steam system 300 is connected with the deaerator 200 through a second regulating valve 900, and the main steam system 300 is used for providing first auxiliary steam for the deaerator 200 so as to keep the pressure of the deaerator 200 stable under the load-shedding working condition; the auxiliary steam system 400 is connected with the deaerator 200 through a third regulating valve 1000, and the auxiliary steam system 400 is used for providing second auxiliary steam for the deaerator 200 through the third regulating valve 1000 so as to enable the deaerator 200 to operate under the empty load constant pressure operation condition; the pressure detection module 500 is arranged on the deaerator 200, and the pressure detection module 500 is used for acquiring the pressure of the deaerator 200; the first-order hysteresis module 600 is used for judging whether the load shedding working condition of the steam turbine of the nuclear power unit occurs according to the pressure of the deaerator 200, and sending a trigger signal when judging that the load shedding working condition of the steam turbine occurs; the adjusting module 700 is configured to control the second adjusting valve 900 when receiving the trigger signal, so that the pressure of the deaerator 200 is reduced at a preset rate after a preset time of maintaining the pressure before the load is thrown.
Specifically, the first regulating valve may be a pneumatic switch valve, the deaerator 200 may heat the condensed water entering the deaerator by using steam, break up the condensed water, and finally remove oxygen in the condensed water, so as to achieve the deaeration effect, and the steam may be from the high pressure cylinder 100, the main steam system 300 and the auxiliary steam system 400. The adjusting module 700 may control the opening degrees of the second adjusting valve 900 and the third adjusting valve 1000, so as to adjust the pressure of the deaerator 200 according to the actual requirement by using the auxiliary steam, and maintain the deaerator pressure at the set pressure. When the deaerator water level is too high, the second and third regulating valves 900 and 1000 are automatically closed to prevent the occurrence of a steam turbine water inlet accident.
As shown in fig. 1, the operation modes of the deaerator 200 can be divided into the following four modes according to different working conditions of the steam turbine of the nuclear power unit system:
first mode of operation: the deaerator 200 operates under constant pressure when the steam turbine of the nuclear power unit is in an empty load working condition. When the steam turbine is in an empty load working condition, the auxiliary steam system 400 and the third regulating valve 1000 are utilized to provide second auxiliary steam for the deaerator 200 in the starting stage, so that the deaerator 200 is maintained to operate under pressure and constant pressure. Wherein, the reference value of the first pressure is 0.12MPa (a), and the pressure can be adjusted according to specific conditions.
Second mode of operation: the deaerator 200 operates at constant pressure when the steam turbine of the nuclear power unit is in a low-load working condition. When the turbine load is at a lower level and gradually increases, the deaerator 200 is maintained at a constant pressure of two operating pressures by providing the deaerator 200 with a first auxiliary steam using the main steam system 300 and a regulated steam regulator, i.e., the second regulator 900. Wherein, the reference value of the pressure II is 0.17MPa (a), and the pressure II can be adjusted according to specific conditions.
Third mode of operation: and when the steam turbine of the nuclear power unit is in a normal operation condition, the deaerator 200 operates in a sliding pressure mode. When the steam turbine is in normal operation, if the exhaust pressure from the high-pressure cylinder 100 to the deaerator 200 is greater than the pressure two, the deaerator 200 can deaerate the steam output by the high-pressure cylinder 100, and the deaerator 200 can also supply steam to the exhaust of the high-pressure cylinder 100 through the first regulating valve 800, so that the deaerator 200 can operate in a sliding mode according to the exhaust pressure from the high-pressure cylinder 100 to the deaerator 200. The exhaust pressure from the high-pressure cylinder 100 to the deaerator 200 (deaerator pressure) is a function of the load of the steam turbine, and the first-order hysteresis module 600 calculates the load change condition in real time according to the deaerator pressure, so as to determine whether the load shedding working condition occurs.
Fourth mode of operation: the deaerator 200 performs pressure control when the steam turbine of the nuclear power unit is in a load shedding working condition. When the load shedding occurs to the steam turbine, the pressure of the deaerator 200 is regulated by the regulating module 700 through controlling the second regulating valve 900, so that the steam quantity of the deaerator 200 is controlled, the water supply is ensured to be continuously heated, and the water supply pump is prevented from cavitation.
The first-order hysteresis module 600 tracks that the ramp signal is in steady state, and the change rates of the input signal and the output signal of the system are completely equal, but due to inertia of the system, when the input signal c (T) rises from 0 to 1, the corresponding output signal is delayed from the input signal by a constant T in value, so that the first-order hysteresis link can be also called.
The pressure detection module 500 acquires the pressure of the deaerator 200, namely the exhaust pressure from the high-pressure cylinder 100 to the deaerator 200 in real time, and the first-order hysteresis module 600 judges whether the load shedding working condition occurs to the steam turbine according to the pressure of the deaerator 200 and sends a trigger signal to the adjustment module 700 when judging that the load shedding working condition occurs to the steam turbine. The adjustment module 700 controls the opening of the second adjustment valve 900 when receiving the trigger signal, so that the pressure of the deaerator 200 is maintained at the pressure before the load shedding for a preset time (for example, 300 s) and then drops at a preset rate. Therefore, the multi-signal combination logic is not adopted, the load shedding working condition judgment logic is simplified, only the most direct signal of the pressure of the deaerator is adopted, so that the pressure change of the deaerator can be accurately identified, the load shedding working condition of the steam turbine can be accurately detected, the pressure of the deaerator is controlled to be maintained at the pressure before load shedding for a period of time when the load shedding of the steam turbine is identified, the pressure is reduced again, the requirement of the main water supply pump for sucking the pressure head is met, the condensate water can be ensured to be continuously heated, the original load set value can be quickly recovered to continuously operate after the fault of the unit is eliminated, and the continuous and stable operation of the unit can be maintained. As shown in FIG. 2, in one embodiment of the invention, pressure sensing module 500 can include a first pressure transmitter 510, a second pressure transmitter 520, and a third pressure transmitter 530. When none of the first, second, and third pressure transmitters 510, 520, 530 fails, the pressure detection module 500 obtains the pressure of the deaerator 200 based on the median of the pressures detected by the first, second, and third pressure transmitters 510, 520, 530; when any one of the first, second and third pressure transmitters 510, 520 and 530 fails, the pressure detection module 500 acquires the pressure of the deaerator 200 based on an average of the pressures detected by the two pressure transmitters that have not failed; when any two of the first, second and third pressure transmitters 510, 520 and 530 fail, the pressure detection module 500 acquires the pressure of the deaerator 200 based on the pressure detected by the non-failed pressure transmitter; when the first, second and third pressure transmitters 510, 520 and 530 fail, the pressure detection module 500 acquires the pressure of the deaerator 200 according to the last detected effective value in the first, second and third pressure transmitters 510, 520 and 530.
Specifically, the deaerator 200 detects the pressure of the deaerator 200 through the pressure detection module 500, and adopts a three-in-one logic method, and the specific processing logic is as follows: when the transmitters have no faults, outputting the three-median value; when one transmitter fails, outputting an average value of the other two normal working transmitters; when two transmitters fail, outputting the values of the other normal working transmitters; when all three transmitters fail, the output keeps the last effective value; the pressure detection module 500 outputs a transmitter failure signal while outputting a pressure signal of the deaerator 200.
The pressure signal of the deaerator 200 output by the pressure detection module 500 will be used as a regulated quantity when the deaerator 200 is operated. When there are two faults in the three pressure transmitters, the pressure control of the deaerator 200 is switched to manual control. When the pressure value of the deaerator 200 is too high, an alarm is given at a DCS (Distributed Control System ) operator station
In one embodiment of the present invention, the transfer function of the first order hysteresis module 600 may be obtained according to the following equation:where τ is the filter time, e.g., τ=10s, s is a variable.
In one embodiment of the present invention, the first-order hysteresis module 600 is capable of determining that the turbine is experiencing a load dump condition when it detects that the pressure reduction rate of the deaerator 200 reaches 80KPa/10s or that the pressure step drops by 80 KPa. The pressure of the deaerator 200 is the exhaust pressure from the high-pressure cylinder 100 to the deaerator 200.
It should be noted that, the first-order hysteresis module 600 may determine the load shedding condition by determining the rate of change of the exhaust pressure from the high-pressure cylinder 100 to the deaerator 200 based on the direct signal of the exhaust pressure from the high-pressure cylinder 100 to the deaerator 200. Since the pressure signal detected by the pressure detection module 500 has the characteristic of jitter, the first-order hysteresis module 600 can inhibit the periodic interference of the pressure signal by setting the transfer function, so as to obtain the accurate variation condition of the exhaust pressure from the high-pressure cylinder 100 to the deaerator 200. The selection of the filtering time τ is very critical to the accuracy of the judgment of the first-order hysteresis module 600, and the filtering time τ is required to adapt to the rapid change of the exhaust pressure from the high-pressure cylinder 100 to the deaerator 200, so that the filtering result can keep up with enough sensitivity in time, and the occurrence of the false recognition load shedding working condition caused by excessively sensitive failure to effectively filter interference is prevented. Therefore, according to the load shedding characteristic of the steam turbine, namely, the greater the rate of reducing the exhaust pressure from the high-pressure cylinder 100 to the deaerator 200, the shorter the time required for reducing the exhaust pressure, the filtering time tau=10s is selected, and the rate of reducing the exhaust pressure from the high-pressure cylinder 100 to the deaerator 200, which is the critical value sent by the trigger signal, is set to 80KPa/10s. When the first-order hysteresis module 600 detects that the rate of reducing the exhaust pressure from the high-pressure cylinder 100 to the deaerator 200 reaches 80KPa/10s or the pressure step drops by 80KPa, the load shedding working condition of the steam turbine is judged.
In one embodiment of the invention, the tuning module 700 may include a given function generator and a PID regulator. The given function generator is used for generating a pressure maintaining curve according to the pressure of the deaerator 200 before load shedding when receiving the trigger signal; the PID regulator is used to control the second regulator valve 900 according to the pressure maintaining curve, so that the pressure of the deaerator 200 changes according to the pressure maintaining curve. As an example, as shown in fig. 3, the pressure variation of the dwell curve may be: the pressure of the deaerator 200 is maintained for 300 seconds before the load is thrown, and then the pressure is reduced to 0 at 0.1MPa/min, wherein the horizontal axis of the graph of FIG. 3 is time, and the vertical axis is deaerator pressure.
Specifically, when the turbine fails to generate a load shedding working condition, the first-order hysteresis module 600 judges that the turbine generates the load shedding working condition and outputs a trigger signal, the given function generator of the adjusting module 700 generates a pressure maintaining curve according to the pressure of the deaerator 200 before the load shedding when receiving the trigger signal, the adjusting module 700 controls the second adjusting valve 900 to be quickly opened according to the pressure maintaining curve through the PID regulator, and a large amount of first auxiliary steam is provided in the main steam system 300 to be input into the deaerator 200 so as to maintain the pressure of the deaerator 200 before the load shedding of the turbine occurs, so that the requirement of the suction pressure head of the main feed pump is met, and the condensation water can be ensured to be continuously heated. The reference set dwell time is 300s, and the dwell time can be adjusted according to specific conditions. If the fault of the unit is processed in the pressure maintaining time, the pressure stabilization of the deaerator 200 can create conditions for the unit to restore the load rising to the original unit state, so that the unit achieves the aim of continuous and stable operation. After the dwell time of 300s, the PID regulator controls the second regulating valve 900 to be closed slowly, so that the pressure of the deaerator 200 is reduced to 0 according to the speed of 0.1MPa/min, and the situation that the second regulating valve 900 is opened in overpressure due to the sudden reduction of the air consumption can be effectively avoided. The setpoint function generator output then tracks the deaerator pressure, and the PID regulator output is zero.
According to the nuclear power unit system provided by the embodiment of the invention, the pressure detection module is used for acquiring the pressure change of the deaerator, the first-order hysteresis module is arranged for judging whether the load shedding working condition occurs to the steam turbine according to the pressure change of the deaerator, and the pressure of the deaerator is controlled to be maintained at the pressure before the load shedding for a period of time through the adjustment module during the load shedding working condition, so that the load shedding working condition of the steam turbine can be accurately detected, the pressure stability of the deaerator is ensured, and the long-term stable operation of the nuclear power unit is facilitated.
In the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. The meaning of "a plurality of" is two or more, unless specifically defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A nuclear power generating unit system, comprising:
a high-pressure cylinder;
the deaerator is connected with an exhaust port of the high-pressure cylinder through a first regulating valve and is used for deaerating the condensate water entering the deaerator through the steam output by the high-pressure cylinder;
the main steam system is connected with the deaerator through a second regulating valve and is used for providing first auxiliary steam for the deaerator;
the auxiliary steam system is connected with the deaerator through a third regulating valve and is used for providing second auxiliary steam for the deaerator through the third regulating valve so that the deaerator operates under an empty load constant pressure operation condition;
the pressure detection module is arranged on the deaerator and is used for acquiring the pressure of the deaerator;
the first-order hysteresis module is used for judging whether the load shedding working condition occurs to the steam turbine of the nuclear power unit according to the pressure of the deaerator, and sending a trigger signal when judging that the load shedding working condition occurs to the steam turbine;
and the adjusting module is used for controlling the second adjusting valve when the trigger signal is received, so that the pressure of the deaerator is maintained at the pressure before load shedding for a preset time and then is reduced at a preset speed.
2. The nuclear power generating system of claim 1 wherein the pressure detection module includes a first pressure transmitter, a second pressure transmitter, and a third pressure transmitter, the pressure detection module being configured to:
when the first pressure transmitter, the second pressure transmitter and the third pressure transmitter are all fault-free, acquiring the pressure of the deaerator according to the median value of the pressures detected by the first pressure transmitter, the second pressure transmitter and the third pressure transmitter;
when any one of the first pressure transmitter, the second pressure transmitter and the third pressure transmitter fails, acquiring the pressure of the deaerator according to the average value of the pressures detected by the two pressure transmitters which do not fail;
when any two pressure transmitters of the first pressure transmitter, the second pressure transmitter and the third pressure transmitter fail, the pressure of the deaerator is obtained according to the pressure detected by the pressure transmitter which does not fail;
and when the first pressure transmitter, the second pressure transmitter and the third pressure transmitter all fail, acquiring the pressure of the deaerator according to the last detected effective values in the first pressure transmitter, the second pressure transmitter and the third pressure transmitter.
3. The nuclear power generating system of claim 1 wherein the transfer function of the first order hysteresis module is obtained according to the following equation:where τ is the filter time and s is the variable.
4. A nuclear power generating system as claimed in claim 3, characterized in that τ = 10s.
5. The nuclear power generating system of claim 4 wherein the first order hysteresis module is specifically configured to:
and when the pressure reduction rate of the deaerator reaches 80KPa/10s or the pressure step drops by 80KPa, judging that the load shedding working condition of the steam turbine occurs.
6. The nuclear power generating system of claim 1 wherein the conditioning module specifically comprises:
the given function generator is used for generating a pressure maintaining curve according to the pressure of the deaerator before load shedding when the trigger signal is received, and the pressure of the pressure maintaining curve is changed into: firstly, keeping the pressure of the deaerator for 300 seconds before load shedding, and then reducing the pressure to 0 at 0.1 MPa/min;
and the PID regulator is used for controlling the second regulating valve according to the pressure maintaining curve so as to change the pressure of the deaerator according to the pressure maintaining curve.
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| CN202310596623.9A CN117095842A (en) | 2023-05-25 | 2023-05-25 | Nuclear power unit system |
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| CN202310596623.9A CN117095842A (en) | 2023-05-25 | 2023-05-25 | Nuclear power unit system |
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| CN202310596623.9A Pending CN117095842A (en) | 2023-05-25 | 2023-05-25 | Nuclear power unit system |
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