CN112212316B - Method for setting operating water level limit value of natural circulation steam generator of sea nuclear platform - Google Patents

Method for setting operating water level limit value of natural circulation steam generator of sea nuclear platform Download PDF

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CN112212316B
CN112212316B CN202010929466.5A CN202010929466A CN112212316B CN 112212316 B CN112212316 B CN 112212316B CN 202010929466 A CN202010929466 A CN 202010929466A CN 112212316 B CN112212316 B CN 112212316B
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water level
limit value
steam generator
swing
circle
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CN112212316A (en
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刘现星
许怀锦
刘建阁
罗捷林
吴国东
彭柳
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Wuhan No 2 Ship Design Institute No 719 Research Institute of China Shipbuilding Industry Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
    • F22B37/46—Applications, arrangements, or dispositions of alarm or automatic safety devices responsive to low or high water level, e.g. for checking, suppressing, extinguishing combustion in boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/26—Steam-separating arrangements
    • F22B37/268—Steam-separating arrangements specially adapted for steam generators of nuclear power plants
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D1/00—Details of nuclear power plant
    • G21D1/006—Details of nuclear power plant primary side of steam generators
    • 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 application relates to a method for setting an operating water level limit value of a natural circulation steam generator of a sea-nuclear platform, which relates to the technical field of steam power systems and comprises the following steps: obtaining the water level h at the top of the steam-water separation cylinderupAnd the height h of the water level at the top of the water supply spray pipednAnd h isupAnd hdnRespectively as the upper limit value L of the operation reference water level of the steam generatormax0And a lower limit value L of the operation reference water levelmin0(ii) a Obtaining the diameter d of the first circle1And diameter d of the second circle2And respectively calculating and obtaining the upper limit value of the swing additional water level at the T moment of the sea nucleus platform at the swing angle theta at the T moment
Figure DDA0002669691410000011
And additional lower limit of swing level
Figure DDA0002669691410000012
According to Lmax0And
Figure DDA0002669691410000013
calculating and obtaining the upper limit value of the operating water level of the steam generator at the moment T
Figure DDA0002669691410000014
And will be
Figure DDA0002669691410000015
Setting a turbine shutdown water level limit value; according to Lmin0And
Figure DDA0002669691410000016
calculating and obtaining the lower limit value of the operating water level of the steam generator at the moment T
Figure DDA0002669691410000017
And will be
Figure DDA0002669691410000018
Set to the steam generator shutdown water level limit.

Description

Method for setting operating water level limit value of natural circulation steam generator of sea nuclear platform
Technical Field
The application relates to the technical field of steam power systems, in particular to a method for setting a limit value of an operating water level of a natural circulation steam generator of a marine nuclear platform.
Background
In a steam power system of a marine nuclear platform, the water level of a natural circulation steam generator plays an important role in the safe operation of a steam turbine and even a reactor.
When the water level of the steam generator is high enough to submerge the steam-water separator, the quality of steam can be rapidly deteriorated, so that the dryness of the steam entering the steam turbine is not satisfactory, the steam turbine blades are damaged, and the safe and stable operation of the steam turbine is influenced. Therefore, when the water level of the steam generator is too high, the operation of the steam turbine needs to be stopped in order to ensure the operation safety of the steam turbine.
When the steam generator operating water level is too low, the following effects may occur: 1) the top of the U-shaped pipe is exposed, so that the heat transfer of the heat transfer pipe is deteriorated, the fluctuation of the water level has adverse effect on the structure and influences the service life of the heat transfer pipe, and the heat transfer pipe is damaged due to thermal stress or thermal fatigue under the limit condition, so that radioactive leakage and primary circuit pressure fluctuation are caused, and the nuclear safety is influenced; 2) the water supply pipe mouth is exposed, may lead to the water hammer phenomenon to appear in the water supply line, leads to the waste heat derivation function's of reactor core deterioration. Therefore, the operating water level of the steam generator cannot be too low to ensure safe operation and nuclear safety of the steam generator.
Different with land nuclear power plant natural circulation steam generator's the operation water level measurement mode, the marine nuclear platform natural circulation steam generator generally adopts two water level reference pipe measuring modes, adopts two water level reference pipe measurement and calculates steam generator's operation water level promptly at steam generator center, can eliminate marine environment to water level measurement's influence.
The upper limit value of the operating water level of the steam generator is generally set to hup(ii) a Setting the lower limit value of the operating water level of the steam generator to hdnWherein h isupAnd hdnThe water level height of the top of the steam-water separation cylinder and the water level height of the top of the water supply spray pipe are respectively. However, due to the limitations of cabin space size and arrangement, the steam generator has large differences in its structure, water capacity, height, etc. from the onshore nuclear power plant steam generator.
However, in the normal operation and operation transient process of the steam generator, due to the influence of the water level measurement error, the measured water level value may not exceed the upper limit value of the operation water level, but the actual water level value exceeds the upper limit value of the operation water level, so that the operation safety of the steam turbine is influenced by the overhigh water level; alternatively, it may happen that the measured water level value does not exceed the lower operating water level limit, but the actual water level value exceeds the lower operating water level limit, resulting in a too low water level affecting the operational safety and nuclear safety of the steam generator. And the local water level of the steam generator is too high but the measured water level does not exceed the upper limit value of the operating water level due to the swinging inclination, or the local water level of the steam generator is too low but the measured water level does not exceed the lower limit value of the operating water level, thereby influencing the actual operation safety of the steam turbine.
Disclosure of Invention
The embodiment of the application provides a method for setting the operating water level limit value of a natural circulation steam generator of a marine nuclear platform, and aims to solve the problems that in the related art, the steam generator has overhigh local water level due to swing and inclination, but the measured water level does not exceed the operating water level upper limit value, so that the operating safety of a steam turbine is influenced, or the steam generator has overlow local water level, but the measured water level does not exceed the operating water level lower limit value, so that the operating safety and the nuclear safety of the steam generator are influenced.
In a first aspect, a method for setting an operating water level limit value of a natural circulation steam generator of a marine nuclear platform is provided, which comprises the following steps:
obtaining the water level h at the top of the steam-water separation cylinderupAnd the height h of the water level at the top of the water supply spray pipednAnd h isupAnd hdnRespectively as the upper limit value L of the operation reference water level of the steam generatormax0And a lower limit value L of the operation reference water levelmin0；
Obtaining the diameter d of the first circle1And diameter d of the second circle2And respectively calculating and obtaining the upper limit value of the swing additional water level at the T moment of the sea nucleus platform at the swing angle theta at the T moment
Figure BDA0002669691390000021
And additional lower limit of swing level
Figure BDA0002669691390000022
Wherein the first circle satisfies: all the steam-water separation cylinders are positioned in the first circle and tangent to the first circle; the second circle satisfies: all the water feed nozzles are located within and tangent to the second circle;
according to Lmax0And
Figure BDA0002669691390000031
calculating and obtaining the upper limit value of the operating water level of the steam generator at the moment T
Figure BDA0002669691390000032
And will be
Figure BDA0002669691390000033
Setting a turbine shutdown water level limit value;
according to Lmin0And
Figure BDA0002669691390000034
calculating and obtaining the lower limit value of the operating water level of the steam generator at the moment T
Figure BDA0002669691390000035
And will be
Figure BDA0002669691390000036
Set to the steam generator shutdown water level limit.
In some embodiments, the diameter d of the first circle is taken1And diameter d of the second circle2And respectively calculating and obtaining the upper limit value of the swing additional water level at the T moment of the sea nucleus platform at the swing angle theta at the T moment
Figure BDA0002669691390000037
And additional lower limit of swing level
Figure BDA0002669691390000038
The method specifically comprises the following steps:
obtaining the diameter d of the first circle1And diameter d of the second circle2And roll angle value at time T of sea-nuclear platform
Figure BDA0002669691390000039
And pitch angle value
Figure BDA00026696913900000310
Respectively calculating to obtain the upper limit value of the initial swing additional water level at the time T
Figure BDA00026696913900000311
And initial swing additional water level lower limit
Figure BDA00026696913900000312
Respectively acquiring the upper limit values of the initial swing additional water level of the sea nucleus platform at the T-1 moment and the T-2 moment
Figure BDA00026696913900000313
And
Figure BDA00026696913900000314
and according to
Figure BDA00026696913900000315
And
Figure BDA00026696913900000316
calculating the predicted value of the upper limit value of the swing additional water level at the time T
Figure BDA00026696913900000317
Selecting
Figure BDA00026696913900000318
And
Figure BDA00026696913900000319
maximum value of (1) as the upper limit value of the swing additional water level at time T
Figure BDA00026696913900000320
Respectively acquiring the lower limit values of the initial swing additional water level of the sea nucleus platform at the T-1 moment and the T-2 moment
Figure BDA00026696913900000321
And
Figure BDA00026696913900000322
and according to
Figure BDA00026696913900000323
And
Figure BDA00026696913900000324
calculating the predicted value of the lower limit value of the swing additional water level at the time T
Figure BDA00026696913900000325
Selecting
Figure BDA00026696913900000326
And
Figure BDA00026696913900000327
maximum value of (1), as swing additional water level lower limit value at time T
Figure BDA00026696913900000328
In some embodiments, the following formula is used to calculate
Figure BDA00026696913900000329
And
Figure BDA00026696913900000330
Figure BDA00026696913900000331
Figure BDA00026696913900000332
in some embodiments, the following formula is used to calculate
Figure BDA00026696913900000333
And
Figure BDA00026696913900000334
Figure BDA00026696913900000335
Figure BDA00026696913900000336
in some embodiments, the tuning method further comprises adjusting
Figure BDA00026696913900000337
And
Figure BDA00026696913900000338
and performing correction.
In some embodiments, the pair
Figure BDA0002669691390000041
And
Figure BDA0002669691390000042
the correction is carried out, and the method specifically comprises the following steps:
measuring range L of the measuring instrument according to the water levelmTheoretical error Δ LtInstrument error deltamSum signal acquisition error deltacAnd calculating to obtain the additional water level value delta L of the water level measurement errorm；
According to Δ LmAre respectively aligned with
Figure BDA0002669691390000043
And
Figure BDA0002669691390000044
correcting, calculating and obtaining the upper limit value of the corrected operation water level of the steam generator at the time T
Figure BDA0002669691390000045
And correcting the lower limit value of the operating water level
Figure BDA0002669691390000046
In some embodiments, Δ L is calculated using the following formulam：
Figure BDA0002669691390000047
In some embodiments, the following formula is used to calculate
Figure BDA0002669691390000048
Figure BDA0002669691390000049
Figure BDA00026696913900000410
In some embodiments, the following formula is used to calculate
Figure BDA00026696913900000411
Figure BDA00026696913900000412
Figure BDA00026696913900000413
The beneficial effect that technical scheme that this application provided brought includes: the application is realized by the upper limit value L of the operation benchmark water level of the steam generatormax0And a lower limit value L of the operation reference water levelmin0Re-setting to obtain the upper limit value of the operating water level of the steam generator at the T moment
Figure BDA00026696913900000414
And lower limit of operating water level
Figure BDA00026696913900000415
Eliminating the swing additional water level upper limit value caused by the actual operation water level generated when the swing is inclined by the angle theta at the moment T
Figure BDA00026696913900000416
And additional lower limit of swing level
Figure BDA00026696913900000417
Thus rocking at time T of the sea-nuclear platformWhen the swing angle is theta, once the highest position of the actual operation water level of the steam generator reaches Lmax0The measured value of the operating water level is
Figure BDA00026696913900000418
The limit value of the stop water level of the steam turbine can be reached, and the operation of stopping the steam turbine is further adopted, so that the effect of protecting the safe operation of the steam turbine is achieved; and once the lowest part of the actual operating water level of the steam generator reaches Lmin0The measured value of the operating water level is
Figure BDA00026696913900000419
The water level limit of the shutdown of the steam generator can be reached, and the shutdown operation is adopted, so that the effect of protecting the safe operation of the steam generator is achieved.
The embodiment of the application provides a method for setting the operating water level limit value of a natural circulation steam generator of a marine nuclear platformmax0And a lower limit value L of the operation reference water levelmin0Re-setting to obtain the upper limit value of the operating water level of the steam generator at the T moment
Figure BDA0002669691390000051
And lower limit of operating water level
Figure BDA0002669691390000052
Eliminating the swing additional water level upper limit value caused by the actual operation water level generated when the swing is inclined by the angle theta at the moment T
Figure BDA0002669691390000053
And additional lower limit of swing level
Figure BDA0002669691390000054
Therefore, when the swing angle of the sea-nuclear platform at the time T is θ, once the highest position of the actual operation water level of the steam generator reaches Lmax0The measured value of the operating water level is
Figure BDA0002669691390000055
The limit value of the stop water level of the steam turbine can be reached, and the operation of stopping the steam turbine is further adopted, so that the effect of protecting the safe operation of the steam turbine is achieved; and once the lowest part of the actual operating water level of the steam generator reaches Lmin0The measured value of the operating water level is
Figure BDA0002669691390000056
The water level limit of the shutdown of the steam generator can be reached, and the shutdown operation is adopted, so that the effect of protecting the safe operation of the steam generator is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for setting an operating water level limit of a natural circulation steam generator of a marine nuclear platform according to an embodiment of the present application;
FIG. 2 is a detailed flowchart of step 101;
FIG. 3 is a schematic diagram illustrating a method for setting a steam generator operational water level limit according to an embodiment of the present disclosure;
FIG. 4 is a schematic view of a first circle;
fig. 5 is a schematic view of a second circle.
In the figure: 1. a steam-water separation cylinder; 2. a water supply spray pipe; 3. a steam generator.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, an embodiment of the present application provides a method for setting an operating water level limit of a natural circulation steam generator of a marine nuclear platform, which includes the following steps:
100: referring to FIG. 3, the water level h at the top of the steam-water separation cylinder 1 is obtainedupAnd the height h of the water level at the top of the water supply spray pipe 2dnWater level h at the top of the steam-water separation cylinder 1upAnd the height h of the water level at the top of the water supply spray pipe 2dnThe height of the water level is when the water level is level with the top of the steam-water separation cylinder 1, and the height of the water level is when the water level is level with the top of the water supply spray pipe 2. And h isupAnd hdnRespectively as an upper limit value L of the operating reference water level of the steam generator 3max0And a lower limit value L of the operation reference water levelmin0If the operating water level of the steam generator 3 exceeds the operating reference water level upper limit value Lmax0In the process, the steam-water separation cylinder 1 is submerged, the quality of steam is rapidly deteriorated, so that the dryness of the steam entering the steam turbine does not meet the requirement, the blades of the steam turbine are damaged, and the safe and stable operation of the steam turbine is influenced; if the operating water level of the steam generator 3 is lower than the lower limit value L of the operating reference water levelmin0In the process, the pipe orifice of the water supply spray pipe 2 is exposed, so that the water hammer phenomenon of a water supply pipeline can occur, and the waste heat deriving function of the reactor core is deteriorated. Therefore, the water level h at the top of the steam-water separation cylinder 1 is usedupAnd the height h of the water level at the top of the water supply spray pipe 2dnAs a reference for the operating water level, preventing the operating water level from exceeding Lmin0～Lmax0Is outside the range of (1).
101: referring to fig. 3-5, the diameter d of the first circle is obtained1And diameter d of the second circle2And respectively calculating and obtaining the upper limit value of the swing additional water level at the T moment of the sea nucleus platform at the swing angle theta at the T moment
Figure BDA0002669691390000061
And additional lower limit of swing level
Figure BDA0002669691390000062
Wherein the first circle satisfies: all the steam-water separation cylinders 1 are positioned in a first circle and tangent to the first circle; the second circle satisfies: all the water supply nozzles 2 are located within and tangent to the second circle; the operation water level of the steam generator 3 is inclined due to the swinging and inclination of the platform, but when the operation water level is measured, the central water level of the inclined water level is measured, and whether the operation water level exceeds L or not is judged according to the central water levelmin0～Lmax0Is outside the range of (1). It may therefore occur that the measured operating water level does not exceed Lmax0But the highest bit of the actual operating water level has exceeded Lmax0Resulting in the actual operating water level being higher than Lmax0The quality of the steam is reduced, so that the operation safety of the steam turbine is influenced; or the measured operation water level is not lower than Lmin0But the lowest level of the actual operating water level is already below Lmin0Resulting in the actual operating water level being below Lmin0Thereby exposing the feed water spray pipe and affecting the operation safety of the steam generator 3. The upper limit value of the swing additional water level calculated in the step
Figure BDA0002669691390000071
Namely, when the swing angle of the sea-nuclear platform is theta, namely the inclination of the actual operation water level is theta, the highest position of the actual operation water level just reaches Lmax0When L ismax0The distance from the center water level of the actual operation water level; lower limit of swing-added water level
Figure BDA0002669691390000072
That is, when the swing angle of the sea-nuclear platform is calculated to be theta, the lowest position of the actual operation water level just reaches Lmin0When L ismin0The distance from the center water level of the actual operation water level.
102: according to Lmax0And
Figure BDA0002669691390000073
calculating and obtaining the upper limit value of the operating water level of the steam generator 3 at the moment T
Figure BDA0002669691390000074
And will be
Figure BDA0002669691390000075
Setting a turbine shutdown water level limit value; upper limit of operating water level
Figure BDA0002669691390000076
Is to Lmax0Re-adjusting the value of Lmax0Move down
Figure BDA0002669691390000077
As an upper limit value of the operation water level of the steam generator 3
Figure BDA0002669691390000078
When the swing angle of the sea-nuclear platform at the moment T is theta, once the highest position of the actual operation water level of the steam generator 3 reaches Lmax0The measured value of the operating water level is
Figure BDA0002669691390000079
The water level limit value of the stop of the steam turbine can be reached, and the operation of stopping the steam turbine is further adopted, so that the effect of protecting the safe operation of the steam turbine is achieved.
103: according to Lmin0And
Figure BDA00026696913900000710
calculating and obtaining the lower limit value of the operating water level of the steam generator 3 at the moment T
Figure BDA00026696913900000711
And will be
Figure BDA00026696913900000712
A shutdown water level limit for the steam generator 3 is set. Lower limit of operating water level
Figure BDA00026696913900000713
Is to Lmin0Re-adjusting the value of Lmin0Upward movement
Figure BDA00026696913900000714
As a lower limit value of the operating water level of the steam generator 3
Figure BDA00026696913900000715
When the swing angle of the sea-nuclear platform at the moment T is theta, once the lowest position of the actual operation water level of the steam generator 3 reaches Lmin0The measured value of the operating water level is
Figure BDA00026696913900000716
The shutdown water level limit of the steam generator 3 is reached, and the shutdown operation is adopted, so that the steam generator 3 is protected to safely operate.
The embodiment of the application has the advantages that the upper limit value L of the operation reference water level of the steam generator 3 is adjustedmax0And a lower limit value L of the operation reference water levelmin0Re-setting to obtain the upper limit value of the operating water level of the steam generator 3 at the T moment
Figure BDA00026696913900000717
And operating water level lower limit
Figure BDA00026696913900000718
Eliminating the swing additional water level upper limit value caused by the actual operation water level generated when the swing is inclined by the angle theta at the moment T
Figure BDA00026696913900000719
And additional lower limit of swing level
Figure BDA00026696913900000720
Therefore, when the swing angle of the sea-nuclear platform T is θ, once the highest position of the actual operation water level of the steam generator 3 reaches Lmax0The measured value of the operating water level is
Figure BDA0002669691390000081
The limit value of the stop water level of the steam turbine can be reached, and the operation of stopping the steam turbine is further adopted, so that the safe operation of the steam turbine is protectedThe function of (1); and once the lowest of the actual operating water level of the steam generator 3 reaches Lmin0The measured value of the operating water level is
Figure BDA0002669691390000082
The water level limit of the steam generator 3 shutdown can be reached, and the shutdown operation is adopted, so that the steam generator and even the nuclear power device can be protected to safely operate.
Referring to FIG. 2, the diameter d of the first circle is obtained1And diameter d of the second circle2And respectively calculating and obtaining the upper limit value of the swing additional water level at the T moment of the sea nucleus platform at the swing angle theta at the T moment
Figure BDA0002669691390000083
And additional lower limit of swing level
Figure BDA0002669691390000084
The method specifically comprises the following steps:
200: obtaining the diameter d of the first circle1And diameter d of the second circle2And roll angle value at time T of sea-nuclear platform
Figure BDA0002669691390000085
And pitch angle value
Figure BDA0002669691390000086
Respectively calculating to obtain the upper limit value of the initial swing additional water level at the time T
Figure BDA0002669691390000087
And initial swing additional water level lower limit
Figure BDA0002669691390000088
Wherein:
Figure BDA0002669691390000089
and calculated by the following formula
Figure BDA00026696913900000810
And
Figure BDA00026696913900000811
Figure BDA00026696913900000812
Figure BDA00026696913900000813
201: respectively acquiring the upper limit values of the initial swing additional water level of the sea nucleus platform at the T-1 moment and the T-2 moment
Figure BDA00026696913900000814
And
Figure BDA00026696913900000815
and according to
Figure BDA00026696913900000816
And
Figure BDA00026696913900000817
calculating the predicted value of the upper limit value of the swing additional water level at the time T
Figure BDA00026696913900000818
Calculated by the following formula
Figure BDA00026696913900000819
Figure BDA00026696913900000820
202: selecting
Figure BDA00026696913900000821
And
Figure BDA00026696913900000822
maximum value of (1) as the upper limit value of the swing additional water level at time T
Figure BDA00026696913900000823
Because the swing angle theta is given by the attitude measuring instrument of the marine nuclear platform, and the swing angle is transmitted from the measurement and signal transmission to the calculation, a certain time lag exists, and the initial swing additional water level upper limit value calculated according to the swing angle measured at the moment T is added to the upper limit value of the water level
Figure BDA00026696913900000824
Possibly less than the upper limit value of the actual initial swing additional water level, adopting
Figure BDA00026696913900000825
And
Figure BDA00026696913900000826
the larger value of the water level is used as the upper limit value of the swing additional water level
Figure BDA00026696913900000827
That is, mixing Lmax0Maximum downward movement, once the upper limit of the operating water level of the steam generator 3 is reached
Figure BDA00026696913900000828
A shutdown can be triggered in advance, and by means of this conservative procedure, the turbine can be ensured to be in an absolutely safe operating state.
203: respectively acquiring the lower limit values of the initial swing additional water level of the sea nucleus platform at the T-1 moment and the T-2 moment
Figure BDA0002669691390000091
And
Figure BDA0002669691390000092
and according to
Figure BDA0002669691390000093
And
Figure BDA0002669691390000094
calculating the predicted value of the lower limit value of the swing additional water level at the time T
Figure BDA0002669691390000095
Calculated by the following formula
Figure BDA0002669691390000096
Figure BDA0002669691390000097
204: selecting
Figure BDA0002669691390000098
And
Figure BDA0002669691390000099
maximum value of (1), as swing additional water level lower limit value at time T
Figure BDA00026696913900000910
As described above, the lower limit value of the initial swing additional water level calculated due to the swing angle measured at time T
Figure BDA00026696913900000911
Possibly less than the lower limit value of the actual initial swing additional water level, adopting
Figure BDA00026696913900000912
And
Figure BDA00026696913900000913
the larger value of the water level is used as a lower limit value of the swing additional water level
Figure BDA00026696913900000914
That is, mixing Lmin0Is moved up to the maximum limit so that the lower limit value of the operation water level of the steam generator 3 is reached once
Figure BDA00026696913900000915
A shutdown can be triggered early (and at the same time the turbine is also shut down), and by this conservative treatment it is possible to ensure a safe operating state of the nuclear power plant.
Preferably, the tuning method further comprises the step of adjusting
Figure BDA00026696913900000916
And
Figure BDA00026696913900000917
and performing correction. The method specifically comprises the following steps:
104: measuring range L of the measuring instrument according to the water levelmTheoretical error Δ LtError delta of instrumentmSum signal acquisition error deltacAnd calculating to obtain the additional water level value delta L of the water level measurement errorm(ii) a For a specific water level measuring instrument, the theoretical error delta LtError delta of instrumentmSum signal acquisition error deltacIs determined. The water level measurement has a certain error, the error magnitude and the range LmRelated, range LmThe wider the error, the range LmThe smaller the error. The natural circulation steam generator of the sea-nuclear platform of the embodiment of the application adopts two measuring modes of narrow range and wide range, adopts the water level measured by the narrow range water level meter during normal operation, and only when the water level exceeds the measuring range of the narrow range meter during abnormal operation (such as the starting of the steam generator) is the water level of the steam generator 3 adopts the measuring value of the wide range water level meter. If L ismax0If the range of the narrow-range water level meter is exceeded, the water level measuring meter at the position selects the wide-range water level meter for calculation, and if L is exceeded, the wide-range water level meter is selected for calculationmax0If the measuring range of the narrow-range water level meter is not exceeded, the water level measuring meter at the position selects the narrow-range water level meter for calculation; if L ismin0If the range of the narrow-range water level meter is exceeded, the water level measuring meter at the position selects the wide-range water level meter for calculation, and if L is exceeded, the wide-range water level meter is selected for calculationmin0And if the measuring range of the narrow-range water level meter is not exceeded, the water level measuring meter at the position selects the narrow-range water level meter for calculation.
105: according to Δ LmAre respectively aligned with
Figure BDA00026696913900000918
And
Figure BDA00026696913900000919
correcting, calculating and obtaining the upper limit value of the corrected operation water level of the steam generator 3 at the time T
Figure BDA0002669691390000101
And correcting the lower limit value of the operating water level
Figure BDA0002669691390000102
Water level measurement error additional water level value delta LmIt may result in the measured operating water level being higher or lower than the actual operating water level. When the actual operating water level exceeds
Figure BDA0002669691390000103
While, the water level measurement error adds the water level value Delta LmThe measured operating water level may be lowered, which is detrimental to the safety of the operation of the turbine, and it is therefore necessary to avoid this situation, for
Figure BDA0002669691390000104
Correcting to eliminate error caused by water level measurement, and calculating with the following formula
Figure BDA0002669691390000105
Figure BDA0002669691390000106
Figure BDA0002669691390000107
When the actual operating water level is lower than
Figure BDA0002669691390000108
While, the water level measurement error adds the water level value Delta LmThe measured operating water level may be increased, which is detrimental to the operational safety of the steam generator 3, and therefore it is desirable to avoid this situation, for
Figure BDA0002669691390000109
The correction is made and calculated by the following formula
Figure BDA00026696913900001010
Figure BDA00026696913900001011
Figure BDA00026696913900001012
Wherein: theoretical error delta L of water leveltError delta of instrumentmSum signal acquisition error deltacVarious errors are eliminated to obtain more accurate upper limit value of corrected operation water level
Figure BDA00026696913900001013
And correcting the lower limit value of the operating water level
Figure BDA00026696913900001014
And calculating Δ L using the following formulam：
Figure BDA00026696913900001015
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A method for setting the limit value of the operating water level of a natural circulation steam generator of a marine nuclear platform is characterized by comprising the following steps:
obtaining the water level h at the top of the steam-water separation cylinder (1)upAnd the water level height h at the top of the water supply spray pipe (2)dnAnd h isupAnd hdnRespectively as the upper limit value L of the operation reference water level of the steam generator (3)max0And a lower limit value L of the operation reference water levelmin0；
Obtaining the diameter d of the first circle1And diameter d of the second circle2And respectively calculating and obtaining the upper limit value of the swing additional water level at the T moment of the sea nucleus platform at the swing angle theta at the T moment
Figure FDA0002669691380000011
And additional lower limit of swing level
Figure FDA0002669691380000012
Wherein the first circle satisfies: all the steam-water separation cylinders (1) are positioned in the first circle and tangent to the first circle; the second circle satisfies: all the water feed nozzles (2) are located within and tangent to the second circle;
according to Lmax0And
Figure FDA0002669691380000013
calculating and obtaining the upper limit value of the operating water level of the steam generator (3) at the time T
Figure FDA0002669691380000014
And will be
Figure FDA0002669691380000015
Setting a turbine shutdown water level limit value;
according to Lmin0And
Figure FDA0002669691380000016
calculating and obtaining the lower limit value of the operating water level of the steam generator (3) at the time T
Figure FDA0002669691380000017
And will be
Figure FDA0002669691380000018
Is set as the shutdown water level limit value of the steam generator (3).
2. The tuning method according to claim 1, wherein the diameter d of the first circle is obtained1And diameter d of the second circle2And respectively calculating and obtaining the upper limit value of the swing additional water level at the T moment of the sea nucleus platform at the swing angle theta at the T moment
Figure FDA0002669691380000019
And additional lower limit of swing level
Figure FDA00026696913800000110
The method specifically comprises the following steps:
obtaining the diameter d of the first circle1And diameter d of the second circle2And roll angle value at time T of sea-nuclear platform
Figure FDA00026696913800000111
And pitch angle value
Figure FDA00026696913800000112
Respectively calculating to obtain the upper limit value of the initial swing additional water level at the time T
Figure FDA00026696913800000113
And initial swing additional water level lower limit
Figure FDA00026696913800000114
Respectively acquiring the upper limit values of the initial swing additional water level of the sea nucleus platform at the T-1 moment and the T-2 moment
Figure FDA00026696913800000115
And
Figure FDA00026696913800000116
and according to
Figure FDA00026696913800000117
And
Figure FDA00026696913800000118
calculating the predicted value of the upper limit value of the swing additional water level at the time T
Figure FDA00026696913800000119
Selecting
Figure FDA00026696913800000120
And
Figure FDA00026696913800000121
maximum value of (1) as the upper limit value of the swing additional water level at time T
Figure FDA00026696913800000122
Respectively acquiring the lower limit values of the initial swing additional water level of the sea nucleus platform at the T-1 moment and the T-2 moment
Figure FDA0002669691380000021
And
Figure FDA0002669691380000022
and according to
Figure FDA0002669691380000023
And
Figure FDA0002669691380000024
calculating the predicted value of the lower limit value of the swing additional water level at the time T
Figure FDA0002669691380000025
Selecting
Figure FDA0002669691380000026
And
Figure FDA0002669691380000027
maximum value of (1) as swing additional water level lower limit value at time T
Figure FDA0002669691380000028
3. The tuning method of claim 2, wherein the following formula is used for calculation
Figure FDA0002669691380000029
And
Figure FDA00026696913800000210
Figure FDA00026696913800000211
Figure FDA00026696913800000212
4. the tuning method of claim 2, wherein the following formula is used for calculation
Figure FDA00026696913800000213
And
Figure FDA00026696913800000214
Figure FDA00026696913800000215
Figure FDA00026696913800000216
5. the tuning method of claim 1, further comprising adjusting
Figure FDA00026696913800000217
And
Figure FDA00026696913800000218
and performing correction.
6. The tuning method of claim 5, wherein
Figure FDA00026696913800000219
And
Figure FDA00026696913800000220
the correction is carried out, and the method specifically comprises the following steps:
measuring range L of the measuring instrument according to the water levelmTheoretical error Δ LtError delta of instrumentmSum signal acquisition error deltacAnd calculating to obtain the additional water level value delta L of the water level measurement errorm；
According to Δ LmAre respectively aligned with
Figure FDA00026696913800000221
And
Figure FDA00026696913800000222
correcting, calculating and obtaining the upper limit value of the corrected operation water level of the steam generator (3) at the time T
Figure FDA00026696913800000223
And correcting the lower limit value of the operating water level
Figure FDA00026696913800000224
7. The tuning method of claim 6, wherein Δ L is calculated using the following formulam：
Figure FDA00026696913800000225
8. The tuning method of claim 6, wherein the following formula is used for calculation
Figure FDA00026696913800000226
Figure FDA00026696913800000227
Figure FDA00026696913800000228
9. The tuning method of claim 6, wherein the following formula is used for calculation
Figure FDA0002669691380000031
Figure FDA0002669691380000032
Figure FDA0002669691380000033
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