CN109029829A - A kind of calculation method and system of Steam Generators in NPP upper section internal pressure - Google Patents

A kind of calculation method and system of Steam Generators in NPP upper section internal pressure Download PDF

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Publication number
CN109029829A
CN109029829A CN201810834105.5A CN201810834105A CN109029829A CN 109029829 A CN109029829 A CN 109029829A CN 201810834105 A CN201810834105 A CN 201810834105A CN 109029829 A CN109029829 A CN 109029829A
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China
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pressure
value
pressure value
measurement instrument
flow measurement
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CN109029829B (en
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高明
高雅军
金圣隆
王佳蒙
赵志盛
仝勇博
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China General Nuclear Power Corp
China Nuclear Power Engineering Co Ltd
CGN Power Co Ltd
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China General Nuclear Power Corp
China Nuclear Power Engineering Co Ltd
CGN Power Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L11/00Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00

Abstract

The invention discloses a kind of calculation methods of Steam Generators in NPP upper section internal pressure, comprising: obtains the first absolute pressure value of the pressure point of the pressure measuring instruments;According to first absolute pressure value, the second absolute pressure value of the lower end pressure point of the flow measurement instrument is obtained;According to the flow value that second absolute pressure value and the flow measurement instrument are surveyed, the third absolute pressure value of the upper end pressure point of the flow measurement instrument is obtained, and using the third absolute pressure value as steam generator upper section internal pressure value.The invention also discloses a kind of computing systems of Steam Generators in NPP upper section internal pressure.The present invention can be improved the accuracy in computation of steam generator upper section internal pressure.

Description

A kind of calculation method and system of Steam Generators in NPP upper section internal pressure
Technical field
The present invention relates to nuclear power station technical field more particularly to a kind of assessments of nuclear safe level DCS software work reliability Method and system.
Background technique
Nuclear power station is mainly made of three parts such as reactor, primary Ioops system and secondary coolant circuit system.Nuclear fission is by core The reactor in-core of fuel composition occurs, and the heat that nuclear fission is released is taken out of by the high pressure water for flowing through the primary Ioops system of reactor core Out-pile and the water that secondary circuit is transferred heat in steamer generator.The Steam Actuation steam turbine generated after water is heated, steams Steam turbine then drives electrical power generators.Steam generator moisture measurement test is crucial unit performance certification test, test As a result it will directly reflect the steam quality of steam generator outlet.Test principle is to introduce nonradioactive tracer, utilize Tracer balancing technique detects and calculates the steam moisture at steam generator outlet.Calculating steam generator interior humidity When, it need to be sampled at the disengagement surface of steam generator upper section and detect tracer concentration therein, while obtain steam hair The absolute pressure of intersegmental part is calculated for humidity on raw device, therefore the acquisition methods of steam generator upper section internal pressure value become The key technology point of this test.
It, can not be by measured directly due to the not set direct pressure measuring point of the upper fragment position of steam generator body Mode obtains the internal pressure of steam generator upper section, is required to carry out pressure conversion to obtain the pressure data of this position at present It obtains.Unit usually only focuses on the steam pressure index of steam generator outlet during normal operation, and apart from steam generator The nearest pressure-measuring-point of upper section is located on the jet chimney in steam generator outlet downstream.
For the internal pressure for obtaining steam generator upper section, current existing technical solution is steamed from steam generator outlet Pressure-measuring-point at steam pipe road obtains gauge pressure data, later the absolute pressure by being converted at steam generator outlet Power finally considers further that the design pressure drop of steam generator outlet current limiter, calculates the absolute pressure of intersegmental part on steam generator Power numerical value.
But above-mentioned technical proposal, during calculating steam generator upper section internal pressure, the last one step is Considering the design pressure drop of steam generator outlet current limiter, simultaneously corrected Calculation goes out the pressure value of intersegmental part on steam generator.And In the actual motion of steam generator, the actual pressure drop of exit restriction can follow the difference of steam flow and change in real time, But the design pressure drop of current limiter is set fixed numbers by above-mentioned technical proposal, then the fixed value is substituted into the above calculating process, It so that the calculated result of steam generator upper section internal pressure is generated deviation, and then influence the performance indicators such as steam moisture Calculated result.
Summary of the invention
The present invention aiming at the problems existing in the prior art, provides a kind of Steam Generators in NPP upper section internal pressure Calculation method and system, can be improved the accuracy in computation of steam generator upper section internal pressure.
The technical solution that the present invention is proposed with regard to above-mentioned technical problem is as follows:
On the one hand, the present invention provides a kind of calculation method of Steam Generators in NPP upper section internal pressure, steam generation Device exit is equipped with pressure measuring instruments and flow measurement instrument, and the pressure point of the pressure measuring instruments is located at steam generator On the main steam line of outlet, the upper end pressure point of the flow measurement instrument is located at steam generator upper section, lower end pressure point On the main steam line;
The calculation method includes:
Obtain the first absolute pressure value of the pressure point of the pressure measuring instruments;
According to first absolute pressure value, the second absolute pressure of the lower end pressure point of the flow measurement instrument is obtained Value;
According to the flow value that second absolute pressure value and the flow measurement instrument are surveyed, the flow measurement is obtained The third absolute pressure value of the upper end pressure point of instrument, and using the third absolute pressure value as intersegmental part on steam generator Pressure value.
Further, the first absolute pressure value of the pressure point for obtaining the pressure measuring instruments, specifically includes:
Obtain the pressure measuring value P that the pressure measuring instruments is surveyedMP.g
According to ambient atmosphere pressure PAtmosphereTo the pressure measuring value PMP.gIt is modified, obtains the pressure measuring instruments Absolute pressure value PMP.a;Wherein, PMP.a=PMP.g+PAtmosphere
Obtain the height difference H between the pressure measuring instruments and its pressure point1With the pressure measuring instruments pressure pipe Interior fluid density ρ1
According to the absolute pressure value PMP.a, the height difference H1With fluid density ρ1, calculate and obtain the pressure-measuring device First absolute pressure value P of the pressure point of table2.a;Wherein, P2.a=PMP.a+P1gH1
Further, described according to first absolute pressure value, obtain the lower end pressure point of the flow measurement instrument The second absolute pressure value, specifically include:
The lower end pressure point of the flow measurement instrument is obtained to the main steaming between the pressure point of the pressure measuring instruments Δ P is lost along stroke pressure in steam pipe roadL2
Δ P is lost along stroke pressure according to the main steam lineL2With the first absolute pressure value P2.a, calculate and obtain the stream Second absolute pressure value P of the lower end pressure point of measurement instrument3.a;Wherein, P3.a=P2.a+ΔPL2
Further, the flow value surveyed according to second absolute pressure value and the flow measurement instrument, is obtained The third absolute pressure value for taking the upper end pressure point of the flow measurement instrument, specifically includes:
Obtain the flow value that the flow measurement instrument is surveyed;
Go out the differential pressure value at the flow measurement instrument both ends according to the flow value inverse;
The amendment of duct height difference is carried out to second absolute pressure value, and in conjunction with the differential pressure value, obtains the flow The third absolute pressure value of the upper end pressure point of measuring instrumentss.
Further, described that the amendment of duct height difference is carried out to second absolute pressure value, and in conjunction with the differential pressure value, The third absolute pressure value for obtaining the upper end pressure point of the flow measurement instrument, specifically includes:
Obtain the height difference H between the flow measurement instrument and its lower end pressure point2, the flow measurement instrument and its Height difference H between upper end pressure point3, fluid density ρ in the pressure pipe of the flow measurement instrument lower end2It is surveyed with the flow Measure the fluid density ρ in the pressure pipe of instrument upper end3
According to the height difference H2, height difference H3, fluid density ρ2, fluid density ρ3, the second absolute pressure value P3.aAnd difference Pressure value Δ PMD, calculate the third absolute pressure value P for obtaining the upper end pressure point of the flow measurement instrument1.a;Wherein, P1.a= P3.a+ΔPMD2gH23gH3
On the other hand, the present invention provides a kind of computing system of Steam Generators in NPP upper section internal pressure, steam hair Raw device exit is equipped with pressure measuring instruments and flow measurement instrument, and the pressure point of the pressure measuring instruments is located at steam generation On the main steam line of device outlet, the upper end pressure point of the flow measurement instrument is located at steam generator upper section, lower end pressure Point is located on the main steam line;
The computing system includes:
First absolute pressure value obtains module, the first absolute pressure of the pressure point for obtaining the pressure measuring instruments Value;
Second absolute pressure value obtains module, for obtaining the flowmeter according to first absolute pressure value Second absolute pressure value of the lower end pressure point of table;
Upper section internal pressure value obtains module, for according to second absolute pressure value and flow measurement instrument institute The flow value of survey obtains the third absolute pressure value of the upper end pressure point of the flow measurement instrument, and the third is absolute Pressure value is as steam generator upper section internal pressure value.
Further, first absolute pressure value obtains module and specifically includes:
Pressure measuring value acquiring unit, the pressure measuring value P surveyed for obtaining the pressure measuring instrumentsMP.g
Atmospheric pressure amending unit, for according to ambient atmosphere pressure PAtmosphereTo the pressure measuring value PMP.gIt is modified, obtains The absolute pressure value P of the pressure measuring instrumentsMP.a;Wherein, PMP.a=PMP.g+PAtmosphere
Data capture unit, for obtaining the height difference H between the pressure measuring instruments and its pressure point1With the pressure Fluid density ρ in force measuring instrument pressure pipe1
First absolute pressure value computing unit, for according to the absolute pressure value PMP.a, the height difference H1It is close with fluid Spend ρ1, calculate the first absolute pressure value P for obtaining the pressure point of the pressure measuring instruments2.a;Wherein, P2.a=PMP.a1gH1
Further, second absolute pressure value obtains module and specifically includes:
Pressure loss acquiring unit, for obtaining the lower end pressure point of the flow measurement instrument to the pressure-measuring device Main steam line between the pressure point of table loses Δ P along stroke pressureL2
Second absolute pressure value computing unit, for losing Δ P along stroke pressure according to the main steam lineL2Absolutely with first To pressure value P2.a, calculate the second absolute pressure value P for obtaining the lower end pressure point of the flow measurement instrument3.a;Wherein, P3.a =P2.a+ΔPL2
Further, the upper section internal pressure value obtains module and specifically includes:
Flow value acquiring unit, the flow value surveyed for obtaining the flow measurement instrument;
Differential pressure value computing unit, for going out the differential pressure value at the flow measurement instrument both ends according to the flow value inverse;
Duct height amending unit for carrying out the amendment of duct height difference to second absolute pressure value, and combines institute Differential pressure value is stated, the third absolute pressure value of the upper end pressure point of the flow measurement instrument is obtained.
Further, the duct height amending unit specifically includes:
Data acquisition subelement, for obtaining the height difference H between the flow measurement instrument and its lower end pressure point2、 Height difference H between the flow measurement instrument and the upper end pressure point3, stream in the pressure pipe of the flow measurement instrument lower end Volume density ρ2With the fluid density ρ in the pressure pipe of the flow measurement instrument upper end3
Third absolute pressure value computation subunit, for according to the height difference H2, height difference H3, fluid density ρ2, fluid Density p3, the second absolute pressure value P3.aWith differential pressure value Δ PMD, calculate the of the upper end pressure point for obtaining the flow measurement instrument Three absolute pressure value P1.a;Wherein, P1.a=P3.a+ΔPMD2gH23gH3
Technical solution provided in an embodiment of the present invention has the benefit that
Using the data of pressure measuring instruments and flow measurement instrument real-time measurement at steam generator outlet, first calculate First absolute pressure value of the pressure point of pressure measuring instruments, then calculate flow measurement instrument lower end pressure point second absolutely Pressure value, and then the third absolute pressure value of the upper end pressure point of flow measurement instrument is calculated, as in steam generator upper section Portion's pressure value is calculated by the data of real-time measurement, can accurately detect steam generator upper section internal pressure value, in turn Improve the accuracy that steam moisture calculates.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other Attached drawing.
Fig. 1 is the structural schematic diagram of the Steam Generators in NPP that the embodiment of the present invention one provides and measurement of correlation instrument;
Fig. 2 is the process of the calculation method for the Steam Generators in NPP upper section internal pressure that the embodiment of the present invention one provides Schematic diagram;
Fig. 3 is the structure of the computing system of Steam Generators in NPP upper section internal pressure provided by Embodiment 2 of the present invention Schematic diagram.
Specific embodiment
In order to solve existing in the prior art can not accurately to obtain the skills such as Steam Generators in NPP upper section internal pressure Art problem, the present invention is intended to provide a kind of calculation method of Steam Generators in NPP upper section internal pressure, core concept is: Using the data of pressure measuring instruments and flow measurement instrument real-time measurement at steam generator outlet, flowmeter is calculated The third absolute pressure value of the upper end pressure point of table, as steam generator upper section internal pressure value.This implementation column passes through real-time The data of measurement are calculated, and can accurately detect steam generator upper section internal pressure value, and then are improved steam moisture and calculated Accuracy.
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention Formula is described in further detail.
Embodiment one
It is connected to as shown in Figure 1, steam generator outlet generally passes through current limiter 14 with main steam line 13, steam generator Exit is equipped with pressure measuring instruments 11 and flow measurement instrument 12, and the pressure point A2 of the pressure measuring instruments 11 is located at steam On the main steam line 13 of generator exports, the upper end pressure point A1 of the flow measurement instrument 12 is located on steam generator Section, lower end pressure point A3 are located on the main steam line 13.Wherein, pressure measuring instruments 11 and flow measurement instrument 12 are set The conventional arrangement mode that mode is steam generator is set, pressure-measuring-point is not arranged directly generally in the upper fragment position of steam generator, Therefore steam generator upper section internal pressure can not be obtained by mode measured directly, it is necessary to pass through the pressure of other positions Data carry out conversion acquisition.
Referring to fig. 2, the embodiment of the invention provides a kind of calculation method of Steam Generators in NPP upper section internal pressure, The calculation method includes:
S1, obtain the pressure measuring instruments pressure point the first absolute pressure value;
S2, according to first absolute pressure value, obtain the second of the lower end pressure point of the flow measurement instrument absolutely Pressure value;
S3, the flow value surveyed according to second absolute pressure value and the flow measurement instrument, obtain the flow The third absolute pressure value of the upper end pressure point of measuring instrumentss, and using the third absolute pressure value as steam generator upper section Internal pressure value.
It should be noted that the pressure point of pressure measuring instruments 11 can be obtained by the data of pressure measuring instruments measurement 11 The absolute pressure value of A2, i.e. the first absolute pressure value.Due to the pressure point A2 and flow measurement instrument 12 of pressure measuring instruments 11 Lower end pressure point A3 be respectively positioned on main steam line, therefore to the first absolute pressure value carry out the amendment of pipeline linear loss after, It can be obtained the absolute pressure value of the lower end pressure point A3 of flow measurement instrument 12, i.e. the second absolute pressure value.Absolutely according to second To pressure value and the data measured by flow measurement instrument 12, it can be obtained the upper end pressure point A1's of flow measurement instrument 12 Absolute pressure value, i.e. third absolute pressure value, and the upper end pressure point A1 of flow measurement instrument 12 is arranged on steam generator Section, therefore third absolute pressure value can be detected as steam generator upper section internal pressure value.In detection steam generator upper section During internal pressure, the present embodiment does not use the design pressure drop numerical value of steam generator outlet current limiter, but uses The data of measuring instrumentss real-time measurement are calculated, and realize the purpose of precisely detection steam generator upper section internal pressure.
Further, in step sl, the first absolute pressure value of the pressure point for obtaining the pressure measuring instruments, It specifically includes:
Obtain the pressure measuring value P that the pressure measuring instruments is surveyedMP.g
According to ambient atmosphere pressure PAtmosphereTo the pressure measuring value PMP.gIt is modified, obtains the pressure measuring instruments Absolute pressure value PMP.a;Wherein, PMP.a=PMP.g+PAtmosphere
Obtain the height difference H between the pressure measuring instruments and its pressure point1With the pressure measuring instruments pressure pipe Interior fluid density ρ1
According to the absolute pressure value PMP.a, the height difference H1With fluid density ρ1, calculate and obtain the pressure-measuring device First absolute pressure value P of the pressure point of table2.a;Wherein, P2.a=PMP.a1gH1
It should be noted that the data of pressure measuring instruments measurement are PMP.a, according to ambient atmosphere pressure to pressure-measuring device The data of table measurement are modified, and calculate the absolute pressure value of pressure measuring instruments:
PMP.a=PMP.g+PAtmosphere
In formula:
PMP.a: the absolute pressure value of pressure measuring instruments, MPa;
PMP.g: the data of the gauge pressure of pressure measuring instruments, i.e. pressure measuring instruments measurement, MPa;
PAtmosphere: ambient atmosphere pressure, MPa.
After the absolute pressure value for obtaining pressure measuring instruments, the height between pressure measuring instruments and its pressure point is measured Difference, as shown in Figure 1, difference in height is H1, while the fluid density in the pressure pipe of pressure measuring instruments is obtained, pressure can be calculated The absolute pressure value of the pressure point of measuring instrumentss:
P2.a=PMP.a±ρ1gH1
In formula:
P2.a: the absolute pressure value of the pressure point of pressure measuring instruments, MPa;
ρ1: the fluid density in pressure measuring instruments pressure pipe, kg/m3;
G: acceleration of gravity;
H1: the difference in height between pressure measuring instruments and its pressure point, m.
The first absolute pressure value P is obtained for example, calculating by above-mentioned formula2.aFor 6.802MPa.a.
Further, in step s 2, described according to first absolute pressure value, obtain the flow measurement instrument Second absolute pressure value of lower end pressure point, specifically includes:
The lower end pressure point of the flow measurement instrument is obtained to the main steaming between the pressure point of the pressure measuring instruments Δ P is lost along stroke pressure in steam pipe roadL2
Δ P is lost along stroke pressure according to the main steam lineL2With the first absolute pressure value P2.a, calculate and obtain the stream Second absolute pressure value P of the lower end pressure point of measurement instrument3.a;Wherein, P3.a=P2.a+ΔPL2
It should be noted that finding flow measurement instrument (narrow range liquid level differential pressure Measurement channel), and confirm that the upper end takes The position of pressure point and lower end pressure point, as shown in Figure 1, the lower end that the pressure point of pressure measuring instruments is located at flow measurement instrument takes The lower end of pressure point, and the distance between pressure point and the lower end pressure point of flow measurement instrument that measure pressure measuring instruments are L2, to obtain the main steam line between the pressure point of measurement pressure measuring instruments and the lower end pressure point of flow measurement instrument Δ P is lost along stroke pressureL2, the absolute pressure value of the lower end pressure point of flow measurement instrument can be calculated:
P3.a=P2.a+ΔPL2
In formula:
P3.a: the absolute pressure value of the lower end pressure point of flow measurement instrument, MPa;
ΔPL2: measure the main steam pipe between the pressure point of pressure measuring instruments and the lower end pressure point of flow measurement instrument Road loses along stroke pressure, MPa.
For example, passing through above-mentioned formula and the first absolute pressure value P2.a=6.802MPa.a can calculate acquisition second absolutely Pressure value P3.aFor 6.815MPa.a.
Further, in step s 4, described to be surveyed according to second absolute pressure value and the flow measurement instrument Flow value, obtain the third absolute pressure value of the upper end pressure point of the flow measurement instrument, specifically include:
Obtain the flow value that the flow measurement instrument is surveyed;
Go out the differential pressure value at the flow measurement instrument both ends according to the flow value inverse;
The amendment of duct height difference is carried out to second absolute pressure value, and in conjunction with the differential pressure value, obtains the flow The third absolute pressure value of the upper end pressure point of measuring instrumentss.
It should be noted that main according to the reverse calculation algorithms in the differential pressure value at flow value inverse outflow measuring instrumentss both ends It is determined by specific instrument calculation specification.For example, differential pressure value=[(flowmeter original measurement current value 13.701mA- instrument amount Journey lower limit 4mA)/instrument range upper limit 16mA] the physics range 950mbar.g=0.0576MPa.g of × instrument at this time, it can obtain The differential pressure value for obtaining flow measurement instrument both ends is 0.0576MPa.g.
Specifically, described that the amendment of duct height difference is carried out to second absolute pressure value, and in conjunction with the differential pressure value, obtain The third absolute pressure value for obtaining the upper end pressure point of the flow measurement instrument, specifically includes:
Obtain the height difference H between the flow measurement instrument and its lower end pressure point2, the flow measurement instrument and its Height difference H between upper end pressure point3, fluid density ρ in the pressure pipe of the flow measurement instrument lower end2It is surveyed with the flow Measure the fluid density ρ in the pressure pipe of instrument upper end3
According to the height difference H2, height difference H3, fluid density ρ2, fluid density ρ3, the second absolute pressure value P3.aAnd difference Pressure value Δ PMD, calculate the third absolute pressure value P for obtaining the upper end pressure point of the flow measurement instrument1.a;Wherein, P1.a= P3.a+ΔPMD2gH23.gH3
It should be noted that the data of flow measurement instrument measurement are obtained, it can the survey of inverse outflow according to the measurement data Measure the differential pressure value at instrument both ends.Difference in height between measuring flow measuring instrumentss and the upper end pressure point, as shown in Figure 1, the height Degree difference is H2, while the fluid density in the pressure pipe of flow measurement instrument lower end is obtained, the exhausted of flow measurement instrument can be calculated To pressure value.And then the difference in height between measuring flow measuring instrumentss and its lower end pressure point, as shown in Figure 1, the difference in height is H3, while the fluid density in the pressure pipe of flow measurement instrument upper end is obtained, the upper end pressure of flow measurement instrument can be calculated The absolute pressure value of point:
P1.a=P3.a+ΔPMD2gH23.gH3
In formula:
ΔPMD: the differential pressure value at flow measurement instrument both ends, MPa;
ρ2: the fluid density in the pressure pipe of flow measurement instrument lower end, kg/m3
H2: the difference in height between flow measurement instrument and its lower end pressure point, m;
ρ3: the fluid density in the pressure pipe of flow measurement instrument upper end, kg/m3
H3: the difference in height between flow measurement instrument and the upper end pressure point, m.
For example, obtaining height difference H in advance2=-2.684m, height difference H3=-2.554m, fluid density ρ2= 1001.586kg/m3, fluid density ρ3=1001.603kg/m3, and combine the second absolute pressure value P of above-mentioned calculating3.a= 6.815MPa.a, differential pressure value Δ PMD=0.0576MPa.g can be obtained third absolute pressure value P by above-mentioned calculation formula1.a For 6.821 MPa.a.
The embodiment of the present invention utilizes the pressure measuring instruments and flow measurement instrument real-time measurement at steam generator outlet Data, first calculate the first absolute pressure value of the pressure point of pressure measuring instruments, then calculate the lower end of flow measurement instrument and take Second absolute pressure value of pressure point, and then the third absolute pressure value of the upper end pressure point of flow measurement instrument is calculated, as steam Vapour generator upper section internal pressure value, is calculated by the data of real-time measurement, can accurately detect steam generator upper section Internal pressure value, and then improve the accuracy that steam moisture calculates.
Embodiment two
The embodiment of the invention provides a kind of computing systems of Steam Generators in NPP upper section internal pressure, can be realized All processes of the calculation method of above-mentioned Steam Generators in NPP upper section internal pressure, referring to Fig. 3, the computing system packet It includes:
First absolute pressure value obtains module 1, the first absolute pressure of the pressure point for obtaining the pressure measuring instruments Force value;
Second absolute pressure value obtains module 2, for obtaining the flowmeter according to first absolute pressure value Second absolute pressure value of the lower end pressure point of table;
Upper section internal pressure value obtains module 3, for according to second absolute pressure value and the flow measurement instrument The flow value surveyed obtains the third absolute pressure value of the upper end pressure point of the flow measurement instrument, and the third is exhausted To pressure value as steam generator upper section internal pressure value.
Further, first absolute pressure value obtains module and specifically includes:
Pressure measuring value acquiring unit, the pressure measuring value P surveyed for obtaining the pressure measuring instrumentsMP.g
Atmospheric pressure amending unit, for according to ambient atmosphere pressure PAtmosphereTo the pressure measuring value PMP.gIt is modified, obtains The absolute pressure value P of the pressure measuring instrumentsMP.a;Wherein, PMP.a=PMP.g+PAtmosphere
Data capture unit, for obtaining the height difference H between the pressure measuring instruments and its pressure point1With the pressure Fluid density ρ in force measuring instrument pressure pipe1
First absolute pressure value computing unit, for according to the absolute pressure value PMP.a, the height difference H1It is close with fluid Spend ρ1, calculate the first absolute pressure value P for obtaining the pressure point of the pressure measuring instruments2.a;Wherein, P2.a=PMP.a1gH1
Further, second absolute pressure value obtains module and specifically includes:
Pressure loss acquiring unit, for obtaining the lower end pressure point of the flow measurement instrument to the pressure-measuring device Main steam line between the pressure point of table loses Δ P along stroke pressureL2
Second absolute pressure value computing unit, for losing Δ P along stroke pressure according to the main steam lineL2Absolutely with first To pressure value P2.a, calculate the second absolute pressure value P for obtaining the lower end pressure point of the flow measurement instrument3.a;Wherein, P3.a =P2.a+ΔPL2
Further, the upper section internal pressure value obtains module and specifically includes:
Flow value acquiring unit, the flow value surveyed for obtaining the flow measurement instrument;
Differential pressure value computing unit, for going out the differential pressure value at the flow measurement instrument both ends according to the flow value inverse;
Duct height amending unit for carrying out the amendment of duct height difference to second absolute pressure value, and combines institute Differential pressure value is stated, the third absolute pressure value of the upper end pressure point of the flow measurement instrument is obtained.
Further, the duct height amending unit specifically includes:
Data acquisition subelement, for obtaining the height difference H between the flow measurement instrument and its lower end pressure point2、 Height difference H between the flow measurement instrument and the upper end pressure point3, stream in the pressure pipe of the flow measurement instrument lower end Volume density ρ2With the fluid density ρ in the pressure pipe of the flow measurement instrument upper end3
Third absolute pressure value computation subunit, for according to the height difference H2, height difference H3, fluid density ρ2, fluid Density p3, the second absolute pressure value P3.aWith differential pressure value Δ PMD, calculate the of the upper end pressure point for obtaining the flow measurement instrument Three absolute pressure value P1.a;Wherein, P1.a=P3.a+ΔPMD2gH23gH3
The embodiment of the present invention utilizes the pressure measuring instruments and flow measurement instrument real-time measurement at steam generator outlet Data, first calculate the first absolute pressure value of the pressure point of pressure measuring instruments, then calculate the lower end of flow measurement instrument and take Second absolute pressure value of pressure point, and then the third absolute pressure value of the upper end pressure point of flow measurement instrument is calculated, as steam Vapour generator upper section internal pressure value, is calculated by the data of real-time measurement, can accurately detect steam generator upper section Internal pressure value, and then improve the accuracy that steam moisture calculates.
In conclusion the invention proposes a kind of calculation method of Steam Generators in NPP upper section internal pressure and being System, with preferable practical function: present embodiments providing a kind of calculating side of new steam generator upper section internal pressure Method can solve the problems, such as that the pressure data when calculating steam generator outlet humidity chooses inaccuracy, no longer make in calculating process With the pressure drop design value of steam generator outlet current limiter, and with the measurement number of actual pressure measuring instrumentss and flow measurement instrument According to substitution, the internal pressure of steam generator upper section can be accurately calculated, improves the accuracy that steam moisture calculates.Through excessive platform core The verification experimental verification of motor group, by the method obtain steam generator upper section internal pressure value than Traditional calculating methods standard Exactness is obviously improved, and can be applied to the implementation of Steam Generators in NPP moisture measurement test.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.

Claims (10)

1. a kind of calculation method of Steam Generators in NPP upper section internal pressure, which is characterized in that at steam generator outlet Equipped with pressure measuring instruments and flow measurement instrument, the pressure point of the pressure measuring instruments is located at the master of steam generator outlet On jet chimney, the upper end pressure point of the flow measurement instrument is located at steam generator upper section, and pressure point in lower end is located at described On main steam line;
The calculation method includes:
Obtain the first absolute pressure value of the pressure point of the pressure measuring instruments;
According to first absolute pressure value, the second absolute pressure value of the lower end pressure point of the flow measurement instrument is obtained;
According to the flow value that second absolute pressure value and the flow measurement instrument are surveyed, the flow measurement instrument is obtained Upper end pressure point third absolute pressure value, and using the third absolute pressure value as steam generator upper section internal pressure Value.
2. the calculation method of Steam Generators in NPP upper section internal pressure as described in claim 1, which is characterized in that described The first absolute pressure value for obtaining the pressure point of the pressure measuring instruments, specifically includes:
Obtain the pressure measuring value P that the pressure measuring instruments is surveyedMP.g
According to ambient atmosphere pressure PAtmosphereTo the pressure measuring value PMP.gIt is modified, obtains the absolute pressure of the pressure measuring instruments Force value PMP.a;Wherein, PMP.a=PMP.g+PAtmosphere
Obtain the height difference H between the pressure measuring instruments and its pressure point1With the stream in the pressure measuring instruments pressure pipe Volume density ρ1
According to the absolute pressure value PMP.a, the height difference H1With fluid density ρ1, calculate and obtain the pressure measuring instruments First absolute pressure value P of pressure point2.a;Wherein, P2.a=PMP.a1gH1
3. the calculation method of Steam Generators in NPP upper section internal pressure as described in claim 1, which is characterized in that described According to first absolute pressure value, the second absolute pressure value of the lower end pressure point of the flow measurement instrument is obtained, specifically Include:
The lower end pressure point of the flow measurement instrument is obtained to the main steam pipe between the pressure point of the pressure measuring instruments Δ P is lost along stroke pressure in roadL2
Δ P is lost along stroke pressure according to the main steam lineL2With the first absolute pressure value P2.a, calculate and obtain the flow survey Measure the second absolute pressure value P of the lower end pressure point of instrument3.a;Wherein, P3.a=P2.a+ΔPL2
4. the calculation method of Steam Generators in NPP upper section internal pressure as described in claim 1, which is characterized in that described According to the flow value that second absolute pressure value and the flow measurement instrument are surveyed, the upper of the flow measurement instrument is obtained The third absolute pressure value for holding pressure point, specifically includes:
Obtain the flow value that the flow measurement instrument is surveyed;
Go out the differential pressure value at the flow measurement instrument both ends according to the flow value inverse;
The amendment of duct height difference is carried out to second absolute pressure value, and in conjunction with the differential pressure value, obtains the flow measurement The third absolute pressure value of the upper end pressure point of instrument.
5. the calculation method of Steam Generators in NPP upper section internal pressure as claimed in claim 4, which is characterized in that described The amendment of duct height difference is carried out to second absolute pressure value, and in conjunction with the differential pressure value, obtains the flow measurement instrument Upper end pressure point third absolute pressure value, specifically include:
Obtain the height difference H between the flow measurement instrument and its lower end pressure point2, the flow measurement instrument and the upper end Height difference H between pressure point3, fluid density ρ in the pressure pipe of the flow measurement instrument lower end2With the flowmeter Fluid density ρ in the pressure pipe of table upper end3
According to the height difference H2, height difference H3, fluid density ρ2, fluid density ρ3, the second absolute pressure value P3.aWith differential pressure value Δ PMD, calculate the third absolute pressure value P for obtaining the upper end pressure point of the flow measurement instrument1.a;Wherein, P1.a=P3.a+Δ PMD2gH23gH3
6. a kind of computing system of Steam Generators in NPP upper section internal pressure, which is characterized in that at steam generator outlet Equipped with pressure measuring instruments and flow measurement instrument, the pressure point of the pressure measuring instruments is located at the master of steam generator outlet On jet chimney, the upper end pressure point of the flow measurement instrument is located at steam generator upper section, and pressure point in lower end is located at described On main steam line;
The computing system includes:
First absolute pressure value obtains module, the first absolute pressure value of the pressure point for obtaining the pressure measuring instruments;
Second absolute pressure value obtains module, for obtaining the flow measurement instrument according to first absolute pressure value Second absolute pressure value of lower end pressure point;
Upper section internal pressure value obtains module, for what is surveyed according to second absolute pressure value and the flow measurement instrument Flow value, obtains the third absolute pressure value of the upper end pressure point of the flow measurement instrument, and by the third absolute pressure Value is used as steam generator upper section internal pressure value.
7. the computing system of Steam Generators in NPP upper section internal pressure as claimed in claim 6, which is characterized in that described First absolute pressure value obtains module and specifically includes:
Pressure measuring value acquiring unit, the pressure measuring value P surveyed for obtaining the pressure measuring instrumentsMP.g
Atmospheric pressure amending unit, for according to ambient atmosphere pressure PAtmosphereTo the pressure measuring value PMP.gIt is modified, described in acquisition The absolute pressure value P of pressure measuring instrumentsMP.a;Wherein, PMP.a=PMP.g+PAtmosphere
Data capture unit, for obtaining the height difference H between the pressure measuring instruments and its pressure point1It is surveyed with the pressure Measure the fluid density ρ in instrument pressure pipe1
First absolute pressure value computing unit, for according to the absolute pressure value PMP.a, the height difference H1And fluid density ρ1, calculate the first absolute pressure value P for obtaining the pressure point of the pressure measuring instruments2.a;Wherein, P2.a=PMP.a1gH1
8. the computing system of Steam Generators in NPP upper section internal pressure as claimed in claim 6, which is characterized in that described Second absolute pressure value obtains module and specifically includes:
Pressure loss acquiring unit, for obtaining the lower end pressure point of the flow measurement instrument to the pressure measuring instruments Main steam line between pressure point loses Δ P along stroke pressureL2
Second absolute pressure value computing unit, for losing Δ P along stroke pressure according to the main steam lineL2With the first absolute pressure Force value P2.a, calculate the second absolute pressure value P for obtaining the lower end pressure point of the flow measurement instrument3.a;Wherein, P3.a=P2.a +ΔPL2
9. the computing system of Steam Generators in NPP upper section internal pressure as claimed in claim 6, which is characterized in that described Upper section internal pressure value obtains module and specifically includes:
Flow value acquiring unit, the flow value surveyed for obtaining the flow measurement instrument;
Differential pressure value computing unit, for going out the differential pressure value at the flow measurement instrument both ends according to the flow value inverse;
Duct height amending unit, for carrying out the amendment of duct height difference to second absolute pressure value, and in conjunction with the difference Pressure value obtains the third absolute pressure value of the upper end pressure point of the flow measurement instrument.
10. the computing system of Steam Generators in NPP upper section internal pressure as claimed in claim 9, which is characterized in that institute Duct height amending unit is stated to specifically include:
Data acquisition subelement, for obtaining the height difference H between the flow measurement instrument and its lower end pressure point2, the stream Height difference H between measurement instrument and the upper end pressure point3, fluid density in the pressure pipe of the flow measurement instrument lower end ρ2With the fluid density ρ in the pressure pipe of the flow measurement instrument upper end3
Third absolute pressure value computation subunit, for according to the height difference H2, height difference H3, fluid density ρ2, fluid density ρ3, the second absolute pressure value P3.aWith differential pressure value Δ PMD, calculate obtain the upper end pressure point of the flow measurement instrument third it is exhausted To pressure value P1.a;Wherein, P1.a=P3.a+ΔPMD2gH23gH3
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