CN116122920A - Nuclear power turbine unit system electric power output abnormality diagnosis method - Google Patents
Nuclear power turbine unit system electric power output abnormality diagnosis method Download PDFInfo
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- CN116122920A CN116122920A CN202211725355.8A CN202211725355A CN116122920A CN 116122920 A CN116122920 A CN 116122920A CN 202211725355 A CN202211725355 A CN 202211725355A CN 116122920 A CN116122920 A CN 116122920A
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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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- 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
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/80—Diagnostics
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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
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Abstract
The invention belongs to the field of nuclear power, and particularly relates to a method for diagnosing abnormal electric power output of a nuclear power turbine unit system, which comprises the following steps: step one: analyzing the overall performance of the unit; step two: comparing and analyzing the history of the measuring point; step three: performing contrast analysis between loops; step four: comparing and analyzing the measuring points; step five: comparing and analyzing between systems; step six: comparing and analyzing among units; step seven: and diagnosing and checking the mechanical efficiency of the unit. The method can diagnose whether the unit electric power output is abnormal according to the current unit running state, and provides a guiding basis for evaluating the nuclear power unit electric power and controlling the reactor power.
Description
Technical Field
The invention belongs to the field of nuclear power, and particularly relates to a nuclear power turbine unit system electric power output abnormality diagnosis method.
Background
The nuclear power steam turbine generator unit adopts a control mode that the reactor thermal power changes along with the power generation power of the steam turbine unit. After the turbine power generation target power is set, the reactor thermal power is adjusted to the corresponding thermal power. The turbine unit output power is related to a number of factors including reactor thermal power, sea water temperature, system efficiency, meter accuracy, and thus the output power is not a constant value. Therefore, when the actual power of the nuclear power unit is supplied, it is difficult for a power plant operator to judge whether the electric power of the turbine unit system is in a normal state.
At present, the reactor display thermal power of the nuclear power plant is generally compared with the maximum limit value to control the unit, so that the output electric power of the turbine unit system generates electricity according to the actual capacity of the unit. But the reactor power shown in the master control room is calibrated based on the thermal power of the turbine unit system loop. The reactor thermal power calculation formula is as follows:
WSG i ＝(H vi -H ei )Q ei -(H vi -H pi )Q pi
wherein:
n is the number of unit loops;
w is reactor thermal power;
WSG i thermal power for each steam generator;
wp is the thermal power delivered to the reactor coolant system by other heat sources than the core;
H vi vapor enthalpy for the vapor generator outlet of each loop;
H ei a main feedwater enthalpy for each loop;
Q ei a main feedwater flow for each loop;
H pi 、Q pi respectively representing the drainage enthalpy and drainage flow of the steam generator of each loop;
from the formula, it can be found that the main feedwater enthalpy value H ei Influencing the calculation of the heat power of the unit, while the enthalpy value H of the main feed water ei From main feed water temperature T fi Determine, therefore, the main feed water temperature T fi Finally determining the electromechanical power P of the nuclear turbine e Is provided, and the reactor thermal power W. Main feed water temperature T fi The output is obtained by measurement of a main water supply thermometer. At the main feed water temperature Ji Gaopiao, the actual thermal work W of the reactor is caused e Higher than the display thermal power W, the output electric power P of the turbo generator set e Too high; when the main water supply thermometer is low in drift, the actual thermal power W of the reactor is caused e The output electric power P of the steam turbine generator unit is lower than the display heat power W e Limited.
Therefore, it is necessary to provide a method for diagnosing abnormal electric power output of a nuclear power turbine unit system so as to rapidly diagnose whether the main feedwater temperature causes abnormal electric power output.
Disclosure of Invention
The invention aims to provide a nuclear power turbine unit system electric power output abnormality diagnosis method which can rapidly judge whether the main water supply temperature causes the electric power output abnormality.
The technical scheme of the invention is as follows:
the invention discloses a nuclear power turbine unit system electric power output abnormality diagnosis method, which comprises the following steps:
step one: analyzing the overall performance of the unit;
step two: comparing and analyzing the history of the measuring point;
step three: performing contrast analysis between loops;
step four: comparing and analyzing the measuring points;
step five: comparing and analyzing between systems;
step six: comparing and analyzing among units;
step seven: and diagnosing and checking the mechanical efficiency of the unit.
Preferably, in the first step, the electric power deviation limit value Δw is set at the same sea water temperature e Thermal efficiency deviation limit Δη e ；
If at present the electric power W ei 、η ei If one of the following conditions is satisfied, execute step two,
|W ea -W ei |＞ΔW e ，
|η ea -η ei |＞Δη e ，
in which W is ea For the historical average electric power, eta at the sea water temperature ea The historical average unit efficiency at the sea water temperature is obtained.
Preferably, in the second step, the unit main feedwater temperature T is determined fi A precision limit; main feed water temperature T fi Maximum allowable deviation deltat of accuracy e The calculation is as follows:
ΔT e ＝ΔT e1 +ΔT e2 ，
in the formula DeltaT e1 Is the allowable deviation delta T in the precision range of the temperature sensing primary element e2 Allowing for deviations within the accuracy class of the temperature transmitter.
Preferably, in the second step, the historical average water supply temperature T under the similar electric power of the same unit is compared fa If the main water supply temperature T is currently displayed fi If the following conditions are met, executing the calibration work of the temperature instrument; if not, executing the third step; after the calibration of the temperature meter is completed, the following steps are still satisfied, step seven is executed,
|T fa -T fi |＞ΔT e 。
preferably, in the third step, a main water supply temperature deviation limit value delta T between different loops of the same unit is determined L Calculating the main water supply temperature deviation displayed by each loop, and if the following formula is met, executing instrument checking work; if not, executing the fourth step; after the calibration of the temperature meter is completed, the following steps are still satisfied, step seven is executed,
max(T fi1 ，T fi2 ，…，T fin )-min(T fi1 ，T fi2 ，…，T fin )＞ΔT L ，
wherein T is fi1 ，T fi2 ，T fin The main feed water temperature for each loop.
Preferably, in the fourth step, the current main water supply on-line instrument T is calculated F With main feed water temperature T fi Temperature deviation delta T at similar locations Fi ，
ΔT F ＝T F -T fi ，
Calculating historical temperature deviation DeltaT F1 ，ΔT F2 ，......，ΔT Fi-1 ，
If the following formula is met, the meter checking work is executed, and if the following formula is not met, the fifth step is executed; after the calibration of the temperature meter is completed, the following steps are still satisfied, step seven is executed,
ΔT Fi ＞max(ΔT F1 ，ΔT F2 ，…，ΔT Fi-1 )。
preferably, in the fifth step, the outlet temperature T of the high-pressure feedwater heater is calculated H With main feed water temperature T fi Deviation deltat of (1) Hi ，
ΔT H ＝T H -T fi ，
Calculating historical temperature deviation DeltaT H1 ，ΔT H2 ，ΔT Hi-1 ，
If the following formula is met, the meter checking work is executed, and if the following formula is not met, the step six is executed; after the calibration of the temperature meter is completed, the following steps are still satisfied, step seven is executed,
ΔT Hi ＞max(ΔT H1 ，ΔT H2 ，…，ΔT Hi-1 )。
preferably, in the sixth step, the average main water supply temperature deviation limit value deltat of the same model unit under the same sea water temperature and the same power platform is determined m Comparing the historical average main water supply temperature T of the same model machine set at the same sea water temperature and the same power platform m If the current main water supply temperature T fi The meter checking work is executed if the following is satisfied, the step seven is executed if the following is not satisfied,
|T m -T fi |＞ΔT m 。
preferably, in the seventh step, tightness of the turboset system boundary valve is diagnosed.
Preferably, in the seventh step, efficiency diagnosis is performed on the heat exchanger of the turboset system, and efficiency diagnosis is performed on each cylinder of the turboset.
The invention has the remarkable effects that:
(1) The method can diagnose whether the unit electric power output is abnormal according to the current unit running state, and provides a guiding basis for evaluating the nuclear power unit electric power and controlling the reactor power.
(2) The method is verified on a millions of kilowatt nuclear power units in China, and the method is used for on-site diagnosis to find that the main water supply thermometer displays deviation, so that the electric power output is affected.
(3) By using the method, the abnormality of electric power output is diagnosed for the machine set, the electric power is improved by approximately 5MW, the income of 1400 ten thousand yuan is newly increased in one year, and the whole effect of the method is good.
Drawings
FIG. 1 is a schematic diagram of a diagnostic flow of electrical power output anomalies in a nuclear power unit system.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
As shown in FIG. 1, the invention discloses a nuclear power turbine unit system electric power output abnormality diagnosis method, which comprises the following implementation steps:
step one: unit overall performance analysis
Setting the electric power deviation limit value delta W under the same sea water temperature e Thermal efficiency deviation limit Δη e ；
If at present the electric power W ei 、η ei If one of the following conditions is satisfied, execute step two,
|W ea -W ei |＞ΔW e ，
|η ea -η ei |＞Δη e ，
in which W is ea For the historical average electric power, eta at the sea water temperature ea The historical average unit efficiency at the sea water temperature is obtained.
Step two: measuring point self history contrast analysis (historical data analysis)
Determining the main water supply temperature T of the unit fi Accuracy limit, main water supply temperature T fi Maximum allowable deviation deltat of accuracy e The calculation is as follows:
ΔT e ＝ΔT e1 +ΔT e2 ，
in the formula DeltaT e1 Is the allowable deviation delta T in the precision range of the temperature sensing primary element e2 Allowing deviation in the precision grade range of the temperature transmitter;
comparing the historical average water supply temperature T under the similar electric power of the same unit fa If the main water supply temperature T is currently displayed fi If the following conditions are met, executing the calibration work of the temperature instrument; if not, executing the third step; after the calibration of the temperature meter is completed, the following steps are still satisfied, step seven is executed,
|T fa -T fi |＞ΔT e 。
step three: inter-loop contrast analysis (inter-loop analysis)
Determining main water supply deviation limit value delta T between different loops of same unit L ，
Calculating the main water supply temperature deviation displayed by each loop, and if the following formula is met, executing instrument checking work; and if not, executing the step four. After the calibration of the temperature meter is completed, the following steps are still satisfied, step seven is executed,
max(T fi1 ，T fi2 ，…，T fin )-min(T fi1 ，T fi2 ，…，T fin )＞ΔT L ，
wherein T is fi1 ，T fi2 ，T fin The main feed water temperature for each loop.
Step four: inter-site contrast analysis (inter-site analysis)
Calculating the current main water supply on-line instrument T F With main feed water temperature T fi Temperature deviation delta T at similar locations Fi ，
ΔT F ＝T F -T fi ，
Calculating historical temperature deviation DeltaT F1 ，ΔT F2 ，......，ΔT Fi-1 ，
If the following formula is met, the meter checking work is executed, and if the following formula is not met, the fifth step is executed; after the calibration of the temperature meter is completed, the following steps are still satisfied, step seven is executed,
ΔT Fi ＞max(ΔT F1 ，ΔT F2 ，…，ΔT Fi-1 ）。
step five: intersystem contrast analysis (intersystem analysis)
Calculating the outlet temperature T of the high-pressure feed water heater H With main feed water temperature T fi Deviation deltat of (1) Hi ，
ΔT H ＝T H -T fi ，
Calculating historical temperature deviation DeltaT H1 ，ΔT H2 ，ΔT Hi-1 ，
If the following formula is met, the meter checking work is executed, and if the following formula is not met, the step six is executed; after the calibration of the temperature meter is completed, the following steps are still satisfied, step seven is executed,
ΔT Hi ＞max(ΔT H1 ，ΔT H2 ，…，ΔT Hi-1 )。
step six: inter-unit contrast analysis (inter-unit analysis)
Determining that the same model machine set is in the same sea waterAverage main feedwater temperature deviation limit DeltaT for temperature and same power platform m Comparing the historical average main water supply temperature T of the same model machine set at the same sea water temperature and the same power platform m If the current main water supply temperature T fi The meter checking work is executed if the following is satisfied, the step seven is executed if the following is not satisfied,
|T m -T fi |＞ΔT m 。
step seven: unit mechanical efficiency diagnostic check
And diagnosing tightness of boundary valves of the turboset system, diagnosing efficiency of heat exchangers of the turboset system, and diagnosing efficiency of each cylinder of the turboset.
The method is verified on a millions of kilowatt nuclear power units in China, and the method is used for on-site diagnosis to find that the main water supply thermometer displays deviation, so that the electric power output is affected. The electric power output conditions before and after adjustment are as follows:
by using the method, the abnormality of electric power output is diagnosed for the unit, the electric power is improved by approximately 5MW, the income of 1400 ten thousand yuan is newly increased in one year, and the whole effect of the method is good.
While the fundamental principles, principal features, and advantages of the present invention have been shown and described, it will be apparent to those skilled in the art that the present invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. A nuclear power turbine unit system electric power output abnormality diagnosis method is characterized in that: the method comprises the following steps:
step one: analyzing the overall performance of the unit;
step two: comparing and analyzing the history of the measuring point;
step three: performing contrast analysis between loops;
step four: comparing and analyzing the measuring points;
step five: comparing and analyzing between systems;
step six: comparing and analyzing among units;
step seven: and diagnosing and checking the mechanical efficiency of the unit.
2. The method for diagnosing abnormal electric power output of a nuclear power turbine unit system according to claim 1, wherein the method comprises the steps of: in the first step, an electric power deviation limit value delta W at the same sea water temperature is set e Thermal efficiency deviation limit Δη e ；
If at present the electric power W ei 、η ei If one of the following conditions is satisfied, execute step two,
|W ea -W ei |＞ΔW e ，
|η ea -η ei |＞Δη e ，
in which W is ea For the historical average electric power, eta at the sea water temperature ea The historical average unit efficiency at the sea water temperature is obtained.
3. The method for diagnosing abnormal electric power output of a nuclear power turbine unit system according to claim 2, wherein: in the second step, the determining machineGroup main feed water temperature T fi A precision limit; main feed water temperature T fi Maximum allowable deviation deltat of accuracy e The calculation is as follows:
ΔT e ＝ΔT e1 +ΔT e2 ，
in the formula DeltaT e1 Is the allowable deviation delta T in the precision range of the temperature sensing primary element e2 Allowing for deviations within the accuracy class of the temperature transmitter.
4. A method for diagnosing an abnormality in electric power output of a nuclear power turbine unit system as set forth in claim 3, characterized in that: in the second step, the historical average water supply temperature T under the similar electric power of the same unit is compared fa If the main water supply temperature T is currently displayed fi If the following conditions are met, executing the calibration work of the temperature instrument; if not, executing the third step; after the calibration of the temperature meter is completed, the following steps are still satisfied, step seven is executed,
|T fa -T fi |＞ΔT e 。
5. the method for diagnosing abnormal electric power output of a nuclear power turbine unit system according to claim 4, wherein the method comprises the steps of: in the third step, the main water supply temperature deviation limit value delta T among different loops of the same unit is determined L Calculating the main water supply temperature deviation displayed by each loop, and if the following formula is met, executing instrument checking work; if not, executing the fourth step; after the calibration of the temperature meter is completed, the following steps are still satisfied, step seven is executed,
max(T fi1 ，T fi2 ，…，T fin )-min(T fi1 ，T fi2 ，…，T fin )＞ΔT L ，
wherein T is fi1 ，T fi2 ，T fin The main feed water temperature for each loop.
6. The method for diagnosing abnormal electric power output of a nuclear power turbine unit system according to claim 5, wherein the method comprises the steps of: in the fourth step, the current main supply is calculatedWater on-line instrument T F With main feed water temperature T fi Temperature deviation delta T at similar locations Fi ，
ΔT F ＝T F -T fi ，
Calculating historical temperature deviation DeltaT F1 ，ΔT F2 ，......，ΔT Fi-1 ，
If the following formula is met, the meter checking work is executed, and if the following formula is not met, the fifth step is executed; after the calibration of the temperature meter is completed, the following steps are still satisfied, step seven is executed,
ΔT Fi ＞max(ΔT F1 ，ΔT F2 ，…，ΔT Fi-1 )。
7. the method for diagnosing abnormal electric power output of a nuclear power turbine unit system according to claim 6, wherein: in the fifth step, the outlet temperature T of the high-pressure feed water heater is calculated H With main feed water temperature T fi Deviation deltat of (1) Hi ，
ΔT H ＝T H -T fi ，
Calculating historical temperature deviation DeltaT H1 ，ΔT H2 ，ΔT Hi-1 ，
If the following formula is met, the meter checking work is executed, and if the following formula is not met, the step six is executed; after the calibration of the temperature meter is completed, the following steps are still satisfied, step seven is executed,
ΔT Hi ＞max(ΔT H1 ，ΔT H2 ，…，ΔT Hi-1 )。
8. the method for diagnosing abnormal electric power output of a nuclear power turbine unit system according to claim 7, wherein: in the step six, the average main water supply temperature deviation limit value delta T of the same model units under the same seawater temperature and the same power platform is determined m Comparing the historical average main water supply temperature T of the same model machine set at the same sea water temperature and the same power platform m If the current main water supply temperature T fi The instrument checking work is executed if the following conditions are met, and the steps are executed if the following conditions are not metSeventhly, the method comprises the steps of,
|T m -T fi |＞ΔT m 。
9. the method for diagnosing abnormal electric power output of a nuclear power turbine unit system according to claim 8, wherein the method comprises the steps of: in the seventh step, tightness of the turboset system boundary valve is diagnosed.
10. The method for diagnosing abnormal electric power output of a nuclear power turbine unit system according to claim 9, wherein: in the seventh step, efficiency diagnosis is performed on the heat exchanger of the turboset system, and efficiency diagnosis is performed on each cylinder of the turboset.
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