CN109029829B - Method and system for calculating internal pressure of upper section of steam generator of nuclear power plant - Google Patents
Method and system for calculating internal pressure of upper section of steam generator of nuclear power plant Download PDFInfo
- Publication number
- CN109029829B CN109029829B CN201810834105.5A CN201810834105A CN109029829B CN 109029829 B CN109029829 B CN 109029829B CN 201810834105 A CN201810834105 A CN 201810834105A CN 109029829 B CN109029829 B CN 109029829B
- Authority
- CN
- China
- Prior art keywords
- pressure
- measuring instrument
- value
- pressure value
- absolute
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a method for calculating the internal pressure of the upper section of a steam generator of a nuclear power plant, which comprises the following steps: acquiring a first absolute pressure value of a pressure taking point of the pressure measuring instrument; acquiring a second absolute pressure value of a lower end pressure taking point of the flow measuring instrument according to the first absolute pressure value; and acquiring a third absolute pressure value of the upper end pressure taking point of the flow measuring instrument according to the second absolute pressure value and the flow value measured by the flow measuring instrument, and taking the third absolute pressure value as the internal pressure value of the upper section of the steam generator. The invention also discloses a system for calculating the internal pressure of the upper section of the steam generator of the nuclear power plant. The method and the device can improve the calculation accuracy of the internal pressure of the upper section of the steam generator.
Description
Technical Field
The invention relates to the technical field of nuclear power stations, in particular to a method and a system for evaluating the working reliability of nuclear security level DCS software.
Background
The nuclear power plant mainly comprises a reactor, a loop system, a secondary loop system and the like. Nuclear fission occurs in a reactor core composed of nuclear fuel, and the heat given off by the nuclear fission is carried out of the core by high pressure water flowing through the primary system of the core and transferred to the secondary water in a steamer generator. The steam generated after the water is heated pushes the steam turbine, and the steam turbine drives the generator to generate electricity. The steam generator humidity measurement test is a key unit performance assessment test, and the test result directly reflects the steam quality at the outlet of the steam generator. The test principle is to introduce a non-radioactive tracer, and detect and calculate the steam humidity at the outlet of the steam generator by utilizing a tracer equilibrium technology. When the humidity inside the steam generator is calculated, sampling is carried out at a steam-water interface of the upper section of the steam generator, the concentration of the tracer in the steam-water interface is detected, and meanwhile, the absolute pressure inside the upper section of the steam generator is obtained and used for calculating the humidity, so that the method for obtaining the pressure value inside the upper section of the steam generator becomes a key technical point of the experiment.
Because the upper section position of the steam generator body is not provided with a direct pressure measuring point, the internal pressure of the upper section of the steam generator can not be obtained in a direct measuring mode, and pressure data at the position needs to be obtained by pressure conversion at present. During normal operation of the unit, only the steam pressure indicator at the outlet of the steam generator is usually taken into account, and the pressure measuring point closest to the upper section of the steam generator is located on the steam line downstream of the outlet of the steam generator.
In order to obtain the internal pressure of the upper section of the steam generator, the current technical scheme is to obtain instrument pressure data from a pressure measuring point at a steam pipeline at the outlet of the steam generator, then obtain the absolute pressure at the outlet of the steam generator through conversion, and finally calculate the absolute pressure value inside the upper section of the steam generator by considering the design pressure drop of a flow restrictor at the outlet of the steam generator.
However, in the above technical solution, in the process of calculating the pressure inside the upper section of the steam generator, the last step is to take into account the designed pressure drop of the outlet restrictor of the steam generator and correct the calculated pressure value inside the upper section of the steam generator. In the actual operation of the steam generator, the actual pressure drop of the outlet flow restrictor changes in real time along with the difference of the steam flow, but the design pressure drop of the flow restrictor is set to be a fixed value according to the technical scheme, and the fixed value is substituted into the calculation process, so that the calculation result of the internal pressure of the upper section of the steam generator is inevitably deviated, and the calculation result of performance indexes such as steam humidity is further influenced.
Disclosure of Invention
The invention provides a method and a system for calculating the internal pressure of the upper section of a steam generator of a nuclear power plant, aiming at the problems in the prior art, and the method and the system can improve the calculation accuracy of the internal pressure of the upper section of the steam generator.
The technical scheme provided by the invention for the technical problem is as follows:
on one hand, the invention provides a method for calculating the internal pressure of the upper section of a steam generator of a nuclear power plant, wherein a pressure measuring instrument and a flow measuring instrument are arranged at the outlet of the steam generator, the pressure taking point of the pressure measuring instrument is positioned on a main steam pipeline at the outlet of the steam generator, the upper end pressure taking point of the flow measuring instrument is positioned on the upper section of the steam generator, and the lower end pressure taking point of the flow measuring instrument is positioned on the main steam pipeline;
the calculation method comprises the following steps:
acquiring a first absolute pressure value of a pressure taking point of the pressure measuring instrument;
acquiring a second absolute pressure value of a lower end pressure taking point of the flow measuring instrument according to the first absolute pressure value;
and acquiring a third absolute pressure value of the upper end pressure taking point of the flow measuring instrument according to the second absolute pressure value and the flow value measured by the flow measuring instrument, and taking the third absolute pressure value as the internal pressure value of the upper section of the steam generator.
Further, the acquiring a first absolute pressure value of a pressure tapping point of the pressure measurement instrument specifically includes:
obtaining a pressure measurement value P measured by the pressure measuring instrumentMP.g；
According to the ambient atmospheric pressure PAtmosphere (es)For the pressure measured value PMP.gCorrecting to obtain absolute pressure value P of the pressure measuring instrumentMP.a(ii) a Wherein, PMP.a＝PMP.g+PAtmosphere (es)；
Obtaining a height difference H between the pressure measuring instrument and a pressure point thereof1And the fluid density rho in the pressure measuring pipe of the pressure measuring instrument1；
According to the absolute pressure value PMP.aThe height difference H1And fluid density ρ1Calculating and obtaining a first absolute pressure value P of a pressure taking point of the pressure measuring instrument2.a(ii) a Wherein, P2.a＝PMP.a+ρ1gH1。
Further, the acquiring a second absolute pressure value of a lower end pressure taking point of the flow measurement instrument according to the first absolute pressure value specifically includes:
acquiring the on-way pressure loss delta P of the main steam pipeline between the lower end pressure taking point of the flow measuring instrument and the pressure taking point of the pressure measuring instrumentL2；
According to the on-way pressure loss delta P of the main steam pipelineL2And a first absolute pressure value P2.aCalculating and obtaining a second absolute pressure value P of the lower end pressure taking point of the flow measuring instrument3.a(ii) a Wherein, P3.a＝P2.a+ΔPL2。
Further, the acquiring a third absolute pressure value of an upper end pressure taking point of the flow meter according to the second absolute pressure value and the flow value measured by the flow meter specifically includes:
acquiring a flow value measured by the flow measuring instrument;
calculating the differential pressure value at two ends of the flow measuring instrument reversely according to the flow value;
and correcting the height difference of the pipeline for the second absolute pressure value, and combining the differential pressure value to obtain a third absolute pressure value of the upper end pressure taking point of the flow measuring instrument.
Further, the correcting the second absolute pressure value by using the pipeline height difference, and combining the differential pressure value to obtain a third absolute pressure value of the upper end pressure taking point of the flow meter specifically includes:
obtaining a height difference H between the flowmeter and a lower end pressure point thereof2Height difference H between the flow meter and the upper end pressure taking point thereof3And the density rho of the fluid in the pressure pipe at the lower end of the flow measuring instrument2And the density rho of the fluid in the pressure taking pipe at the upper end of the flow measuring instrument3；
According to the height difference H2Height difference H3Fluid density ρ2Fluid density ρ3A second absolute pressure value P3.aAnd differential pressure value Δ PMDCalculating and obtaining a third absolute pressure value P of an upper end pressure taking point of the flow measuring instrument1.a(ii) a Wherein, P1.a＝P3.a+ΔPMD+ρ2gH2+ρ3gH3。
On the other hand, the invention provides a system for calculating the internal pressure of the upper section of a steam generator of a nuclear power plant, wherein a pressure measuring instrument and a flow measuring instrument are arranged at the outlet of the steam generator, the pressure taking point of the pressure measuring instrument is positioned on a main steam pipeline at the outlet of the steam generator, the upper end pressure taking point of the flow measuring instrument is positioned on the upper section of the steam generator, and the lower end pressure taking point of the flow measuring instrument is positioned on the main steam pipeline;
the computing system includes:
the first absolute pressure value acquisition module is used for acquiring a first absolute pressure value of a pressure taking point of the pressure measuring instrument;
the second absolute pressure value acquisition module is used for acquiring a second absolute pressure value of a lower end pressure taking point of the flow measuring instrument according to the first absolute pressure value;
and the upper section internal pressure value acquisition module is used for acquiring a third absolute pressure value of an upper end pressure taking point of the flow measuring instrument according to the second absolute pressure value and the flow value measured by the flow measuring instrument, and taking the third absolute pressure value as the upper section internal pressure value of the steam generator.
Further, the first absolute pressure value obtaining module specifically includes:
a pressure measurement value acquisition unit for acquiring the pressure measurement value P measured by the pressure measurement instrumentMP.g；
An atmospheric pressure correction unit for correcting the atmospheric pressure P according to the ambient atmospheric pressureAtmosphere (es)For the pressure measured value PMP.gCorrecting to obtain absolute pressure value P of the pressure measuring instrumentMP.a(ii) a Wherein, PMP.a＝PMP.g+PAtmosphere (es)；
A data acquisition unit for acquiring the height difference H between the pressure measuring instrument and the pressure point1And the fluid density rho in the pressure measuring pipe of the pressure measuring instrument1；
A first absolute pressure value calculation unit for calculating the absolute pressure value PMP.aThe height difference H1And fluid density ρ1Calculating and obtaining a first absolute pressure value P of a pressure taking point of the pressure measuring instrument2.a(ii) a Wherein, P2.a＝PMP.a+ρ1gH1。
Further, the second absolute pressure value obtaining module specifically includes:
a pressure loss obtaining unit for obtaining the on-way pressure loss delta P of the main steam pipeline between the pressure taking point of the lower end of the flow measuring instrument and the pressure taking point of the pressure measuring instrumentL2；
A second absolute pressure value calculation unit for calculating a second absolute pressure value according to the on-way pressure loss Delta P of the main steam pipelineL2And a first absolute pressure value P2.aAnd calculating to obtain a second absolute pressure point of the lower end pressure taking point of the flow measuring instrumentTo pressure value P3.a(ii) a Wherein, P3.a＝P2.a+ΔPL2。
Further, the upper-section internal pressure value obtaining module specifically includes:
a flow value acquisition unit for acquiring a flow value measured by the flow meter;
the differential pressure value calculating unit is used for back calculating the differential pressure value at the two ends of the flow measuring instrument according to the flow value;
and the pipeline height correction unit is used for correcting the pipeline height difference of the second absolute pressure value and obtaining a third absolute pressure value of the upper end pressure taking point of the flow measuring instrument by combining the differential pressure value.
Further, the duct height correction unit specifically includes:
a data acquisition subunit for acquiring the height difference H between the flowmeter and the pressure point at the lower end thereof2Height difference H between the flow meter and the upper end pressure taking point thereof3And the density rho of the fluid in the pressure pipe at the lower end of the flow measuring instrument2And the density rho of the fluid in the pressure taking pipe at the upper end of the flow measuring instrument3；
A third absolute pressure value calculating operator unit for calculating the height difference H2Height difference H3Fluid density ρ2Fluid density ρ3A second absolute pressure value P3.aAnd differential pressure value Δ PMDCalculating and obtaining a third absolute pressure value P of an upper end pressure taking point of the flow measuring instrument1.a(ii) a Wherein, P1.a＝P3.a+ΔPMD+ρ2gH2+ρ3gH3。
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
utilize the real-time measuring data of pressure measurement instrument and flow meter at the steam generator exit, calculate the first absolute pressure value of the pressure point of pressure measurement instrument earlier, calculate the second absolute pressure value of the lower extreme pressure point of flow meter again, and then calculate the third absolute pressure value of the upper end pressure point of flow meter, be the steam generator upper segment internal pressure value promptly, calculate through real-time measuring's data, can accurately detect out the steam generator upper segment internal pressure value, and then improve the accuracy that steam humidity calculated.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, 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 schematic diagram of a nuclear power plant steam generator and associated instrumentation according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for calculating an internal pressure of an upper stage of a steam generator of a nuclear power plant according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a system for calculating the internal pressure of the upper stage of the steam generator of the nuclear power plant according to the second embodiment of the present invention.
Detailed Description
In order to solve the technical problems that the internal pressure of the upper section of a steam generator of a nuclear power plant cannot be accurately obtained in the prior art, the invention aims to provide a method for calculating the internal pressure of the upper section of the steam generator of the nuclear power plant, which has the core idea that: and calculating a third absolute pressure value of the upper end pressure taking point of the flow measuring instrument by utilizing the data measured by the pressure measuring instrument and the flow measuring instrument at the outlet of the steam generator in real time, namely the pressure value in the upper section of the steam generator. According to the steam humidity detection device, the internal pressure value of the upper section of the steam generator can be accurately detected by calculating through real-time measured data, and therefore the accuracy of steam humidity calculation is improved.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example one
As shown in fig. 1, the steam generator outlet is generally communicated with a main steam pipe 13 through a flow restrictor 14, a pressure measuring instrument 11 and a flow measuring instrument 12 are arranged at the steam generator outlet, a pressure taking point a2 of the pressure measuring instrument 11 is positioned on the main steam pipe 13 at the steam generator outlet, an upper pressure taking point a1 of the flow measuring instrument 12 is positioned at the upper section of the steam generator, and a lower pressure taking point A3 is positioned on the main steam pipe 13. The pressure measuring instrument 11 and the flow measuring instrument 12 are arranged in a conventional manner of the steam generator, and a pressure measuring point is not generally directly arranged at an upper stage position of the steam generator, so that the internal pressure of the upper stage of the steam generator cannot be obtained by a direct measuring manner, and the internal pressure must be obtained by converting pressure data of other positions.
Referring to fig. 2, an embodiment of the present invention provides a method for calculating an internal pressure of an upper section of a steam generator of a nuclear power plant, where the method includes:
s1, acquiring a first absolute pressure value of a pressure taking point of the pressure measuring instrument;
s2, acquiring a second absolute pressure value of a lower end pressure taking point of the flow measuring instrument according to the first absolute pressure value;
and S3, acquiring a third absolute pressure value of the upper end pressure taking point of the flow measuring instrument according to the second absolute pressure value and the flow value measured by the flow measuring instrument, and taking the third absolute pressure value as the internal pressure value of the upper section of the steam generator.
It should be noted that the absolute pressure value of the pressure taking point a2 of the pressure measuring instrument 11, i.e. the first absolute pressure value, can be obtained through the data of the pressure measuring instrument 11. Since the pressure taking point a2 of the pressure measuring instrument 11 and the pressure taking point A3 of the lower end of the flow measuring instrument 12 are both located on the main steam pipeline, the absolute pressure value of the pressure taking point A3 of the lower end of the flow measuring instrument 12, that is, the second absolute pressure value, can be obtained after pipeline on-way loss correction is performed on the first absolute pressure value. From the second absolute pressure value and the data measured by the flow meter 12, an absolute pressure value of the upper end pressure taking point a1 of the flow meter 12, that is, a third absolute pressure value, can be obtained, and the upper end pressure taking point a1 of the flow meter 12 is provided at the upper section of the steam generator, so that the third absolute pressure value can be detected as the upper section internal pressure value of the steam generator. In the process of detecting the internal pressure of the upper section of the steam generator, the design pressure drop value of the outlet flow restrictor of the steam generator is not used any more, but the data measured by the measuring instrument in real time is used for calculating, so that the purpose of accurately detecting the internal pressure of the upper section of the steam generator is achieved.
Further, in step S1, the acquiring a first absolute pressure value of a pressure sampling point of the pressure measurement instrument specifically includes:
obtaining a pressure measurement value P measured by the pressure measuring instrumentMP.g；
According to the ambient atmospheric pressure PAtmosphere (es)For the pressure measured value PMP.gCorrecting to obtain absolute pressure value P of the pressure measuring instrumentMP.a(ii) a Wherein, PMP.a＝PMP.g+PAtmosphere (es)；
Obtaining a height difference H between the pressure measuring instrument and a pressure point thereof1And the fluid density rho in the pressure measuring pipe of the pressure measuring instrument1；
According to the absolute pressure value PMP.aThe height difference H1And fluid density ρ1Calculating and obtaining a first absolute pressure value P of a pressure taking point of the pressure measuring instrument2.a(ii) a Wherein, P2.a＝PMP.a+ρ1gH1。
It should be noted that the data measured by the pressure measuring instrument is PMP.aAnd correcting the data measured by the pressure measuring instrument according to the ambient atmospheric pressure, and calculating the absolute pressure value of the pressure measuring instrument:
PMP.a＝PMP.g+Patmosphere (es)
In the formula:
PMP.a: absolute pressure value of pressure measuring instrument, MPa;
PMP.g: gauge pressure of the pressure measuring instrument, namely data measured by the pressure measuring instrument, MPa;
Patmosphere (es): ambient atmospheric pressure, MPa.
After the absolute pressure value of the pressure measuring instrument is obtained, the height difference between the pressure measuring instrument and the pressure taking point is measured, and the height difference is H as shown in figure 11And simultaneously, the fluid density in the pressure taking pipe of the pressure measuring instrument is obtained, so that the absolute pressure value of the pressure taking point of the pressure measuring instrument can be calculated:
P2.a＝PMP.a±ρ1gH1
in the formula:
P2.a: absolute pressure value of pressure point of pressure measuring instrument, MPa;
ρ1: the pressure measuring instrument takes the density of the fluid in the pressure pipe, kg/m 3;
g: acceleration of gravity;
H1: height difference, m, between the pressure measuring instrument and its pressure taking point.
For example, the first absolute pressure value P is obtained by calculation using the above formula2.a6.802 MPa.a.
Further, in step S2, the obtaining, according to the first absolute pressure value, a second absolute pressure value of a lower end pressure taking point of the flow meter specifically includes:
acquiring the on-way pressure loss delta P of the main steam pipeline between the lower end pressure taking point of the flow measuring instrument and the pressure taking point of the pressure measuring instrumentL2；
According to the on-way pressure loss delta P of the main steam pipelineL2And a first absolute pressure value P2.aCalculating and obtaining a second absolute pressure value P of the lower end pressure taking point of the flow measuring instrument3.a(ii) a Wherein, P3.a＝P2.a+ΔPL2。
It should be noted that, a flow meter (narrow range liquid level differential pressure measurement channel) is searched, and the positions of the upper pressure taking point and the lower pressure taking point of the flow meter are confirmed, as shown in fig. 1, the pressure taking point of the pressure meter is located at the lower end of the lower pressure taking point of the flow meter, and the pressure taking point and the lower pressure taking point of the pressure meter are measuredThe distance between the lower pressure points of the flow meter was L2So as to obtain the on-way pressure loss delta P of the main steam pipeline between the pressure taking point of the pressure measuring instrument and the lower end pressure taking point of the flow measuring instrumentL2And calculating the absolute pressure value of the lower end pressure taking point of the flow measuring instrument:
P3.a＝P2.a+ΔPL2
in the formula:
P3.a: absolute pressure value, MPa, of the lower end pressure taking point of the flow measuring instrument;
ΔPL2: and the on-way pressure loss, MPa, of the main steam pipeline between the pressure taking point of the pressure measuring instrument and the pressure taking point at the lower end of the flow measuring instrument is measured.
For example, by the above formula and the first absolute pressure value P2.aThe second absolute pressure value P can be calculated and obtained as 6.802mpa3.a6.815 MPa.a.
Further, in step S4, the acquiring a third absolute pressure value of the upper pressure taking point of the flow meter according to the second absolute pressure value and the flow value measured by the flow meter specifically includes:
acquiring a flow value measured by the flow measuring instrument;
calculating the differential pressure value at two ends of the flow measuring instrument reversely according to the flow value;
and correcting the height difference of the pipeline for the second absolute pressure value, and combining the differential pressure value to obtain a third absolute pressure value of the upper end pressure taking point of the flow measuring instrument.
For example, the differential pressure value is [ the original measurement current value of the flowmeter is 13.701 mA-the lower limit of the meter range is 4 mA)/the upper limit of the meter range is 16mA ] × the physical range of the meter is 950mbar.g is 0.0576mpa.g, and the differential pressure value at both ends of the flow measurement meter is 0.0576 mpa.g.
Specifically, the performing of the pipeline height difference correction on the second absolute pressure value and combining the differential pressure value to obtain a third absolute pressure value of the upper end pressure taking point of the flow meter specifically includes:
obtaining a height difference H between the flowmeter and a lower end pressure point thereof2Height difference H between the flow meter and the upper end pressure taking point thereof3And the density rho of the fluid in the pressure pipe at the lower end of the flow measuring instrument2And the density rho of the fluid in the pressure taking pipe at the upper end of the flow measuring instrument3；
According to the height difference H2Height difference H3Fluid density ρ2Fluid density ρ3A second absolute pressure value P3.aAnd differential pressure value Δ PMDCalculating and obtaining a third absolute pressure value P of an upper end pressure taking point of the flow measuring instrument1.a(ii) a Wherein, P1.a＝P3.a+ΔPMD+ρ2gH2+ρ3gH3。
Data measured by the flow meter is acquired, and the differential pressure value between both ends of the flow meter can be inversely calculated based on the acquired data. Measuring the height difference between the flowmeter and its lower pressure-taking point, as shown in fig. 1, which is H2And simultaneously, the density of the fluid in the pressure taking pipe at the lower end of the flow measuring instrument is obtained, and the absolute pressure value of the flow measuring instrument can be calculated. The height difference between the flowmeter and its upper pressure-taking point is then measured, as shown in FIG. 1, and is H3And simultaneously, the density of the fluid in the pressure taking pipe at the upper end of the flow measuring instrument is obtained, and the absolute pressure value of the pressure taking point at the upper end of the flow measuring instrument can be calculated:
P1.a＝P3.a+ΔPMD+ρ2gH2+ρ3gH3
in the formula:
ΔPMD: differential pressure value, MPa, across the flow meter;
ρ2: fluid density in the pressure tube at the lower end of the flow meter in kg/m3；
H2: height difference m between the flow meter and a pressure point at the lower end of the flow meter;
ρ3: fluid density in kg/m in pressure tube at upper end of flow meter3；
H3: height difference, m, between the flow meter and its upper pressure taking point.
For example, the height difference H is acquired in advance2-2.684m, height difference H3Fluid density ρ at-2.554 m2Fluid density ρ, 1001.586kg/m331001.603kg/m3 in combination with the second absolute pressure value P calculated as described above3.a6.815MPa.a differential pressure value delta PMDThe third absolute pressure value P is obtained by the above calculation formula, which is 0.0576mpa.g1.a6.821 MPa.a.
According to the embodiment of the invention, the pressure measuring instrument at the outlet of the steam generator and the data measured by the flow measuring instrument in real time are utilized, the first absolute pressure value of the pressure taking point of the pressure measuring instrument is calculated firstly, then the second absolute pressure value of the pressure taking point at the lower end of the flow measuring instrument is calculated, and the third absolute pressure value of the pressure taking point at the upper end of the flow measuring instrument is calculated, namely the internal pressure value of the upper section of the steam generator.
Example two
An embodiment of the present invention provides a system for calculating an internal pressure of an upper section of a steam generator of a nuclear power plant, which is capable of implementing all the processes of the method for calculating an internal pressure of an upper section of a steam generator of a nuclear power plant, and with reference to fig. 3, the system includes:
the first absolute pressure value acquisition module 1 is used for acquiring a first absolute pressure value of a pressure taking point of the pressure measuring instrument;
a second absolute pressure value obtaining module 2, configured to obtain, according to the first absolute pressure value, a second absolute pressure value of a lower end pressure taking point of the flow meter;
and the upper section internal pressure value acquisition module 3 is used for acquiring a third absolute pressure value of an upper end pressure taking point of the flow measuring instrument according to the second absolute pressure value and the flow value measured by the flow measuring instrument, and taking the third absolute pressure value as an upper section internal pressure value of the steam generator.
Further, the first absolute pressure value obtaining module specifically includes:
a pressure measurement value acquisition unit for acquiring the pressure measurement value P measured by the pressure measurement instrumentMP.g；
An atmospheric pressure correction unit for correcting the atmospheric pressure P according to the ambient atmospheric pressureAtmosphere (es)For the pressure measured value PMP.gCorrecting to obtain absolute pressure value P of the pressure measuring instrumentMP.a(ii) a Wherein, PMP.a＝PMP.g+PAtmosphere (es)；
A data acquisition unit for acquiring the height difference H between the pressure measuring instrument and the pressure point1And the fluid density rho in the pressure measuring pipe of the pressure measuring instrument1；
A first absolute pressure value calculation unit for calculating the absolute pressure value PMP.aThe height difference H1And fluid density ρ1Calculating and obtaining a first absolute pressure value P of a pressure taking point of the pressure measuring instrument2.a(ii) a Wherein, P2.a＝PMP.a+ρ1gH1。
Further, the second absolute pressure value obtaining module specifically includes:
a pressure loss obtaining unit for obtaining the on-way pressure loss delta P of the main steam pipeline between the pressure taking point of the lower end of the flow measuring instrument and the pressure taking point of the pressure measuring instrumentL2；
A second absolute pressure value calculation unit for calculating a second absolute pressure value according to the on-way pressure loss Delta P of the main steam pipelineL2And a first absolute pressure value P2.aCalculating and obtaining a second absolute pressure value P of the lower end pressure taking point of the flow measuring instrument3.a(ii) a Wherein, P3.a＝P2.a+ΔPL2。
Further, the upper-section internal pressure value obtaining module specifically includes:
a flow value acquisition unit for acquiring a flow value measured by the flow meter;
the differential pressure value calculating unit is used for back calculating the differential pressure value at the two ends of the flow measuring instrument according to the flow value;
and the pipeline height correction unit is used for correcting the pipeline height difference of the second absolute pressure value and obtaining a third absolute pressure value of the upper end pressure taking point of the flow measuring instrument by combining the differential pressure value.
Further, the duct height correction unit specifically includes:
a data acquisition subunit for acquiring the height difference H between the flowmeter and the pressure point at the lower end thereof2Height difference H between the flow meter and the upper end pressure taking point thereof3And the density rho of the fluid in the pressure pipe at the lower end of the flow measuring instrument2And the density rho of the fluid in the pressure taking pipe at the upper end of the flow measuring instrument3；
A third absolute pressure value calculating operator unit for calculating the height difference H2Height difference H3Fluid density ρ2Fluid density ρ3A second absolute pressure value P3.aAnd differential pressure value Δ PMDCalculating and obtaining a third absolute pressure value P of an upper end pressure taking point of the flow measuring instrument1.a(ii) a Wherein, P1.a＝P3.a+ΔPMD+ρ2gH2+ρ3gH3。
According to the embodiment of the invention, the pressure measuring instrument at the outlet of the steam generator and the data measured by the flow measuring instrument in real time are utilized, the first absolute pressure value of the pressure taking point of the pressure measuring instrument is calculated firstly, then the second absolute pressure value of the pressure taking point at the lower end of the flow measuring instrument is calculated, and the third absolute pressure value of the pressure taking point at the upper end of the flow measuring instrument is calculated, namely the internal pressure value of the upper section of the steam generator.
In summary, the invention provides a method and a system for calculating the internal pressure of the upper section of the steam generator of the nuclear power plant, which have the following good practical effects: the embodiment provides a novel method for calculating the internal pressure of the upper section of the steam generator, which can solve the problem of inaccurate pressure data selection when the humidity of the outlet of the steam generator is calculated, the pressure drop design value of the outlet current limiter of the steam generator is not used in the calculation process, and the measurement data of an actual pressure measurement instrument and a measurement data measurement instrument are used for replacing the pressure drop design value, so that the internal pressure of the upper section of the steam generator can be accurately calculated, and the calculation accuracy of the steam humidity is improved. Through the test verification of a plurality of nuclear power generating units, the accuracy of the internal pressure value of the upper section of the steam generator obtained by the method is obviously improved compared with that of the traditional calculation method, and the method can be applied to the implementation of the humidity measurement test of the steam generator of the nuclear power plant.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method for calculating the internal pressure of the upper section of a steam generator of a nuclear power plant is characterized in that a pressure measuring instrument and a flow measuring instrument are arranged at the outlet of the steam generator, the pressure taking point of the pressure measuring instrument is positioned on a main steam pipeline at the outlet of the steam generator, the upper end pressure taking point of the flow measuring instrument is positioned on the upper section of the steam generator, and the lower end pressure taking point is positioned on the main steam pipeline;
the calculation method comprises the following steps:
acquiring a first absolute pressure value of a pressure taking point of the pressure measuring instrument;
acquiring a second absolute pressure value of a lower end pressure taking point of the flow measuring instrument according to the first absolute pressure value;
and acquiring a third absolute pressure value of the upper end pressure taking point of the flow measuring instrument according to the second absolute pressure value and the flow value measured by the flow measuring instrument, and taking the third absolute pressure value as the internal pressure value of the upper section of the steam generator.
2. The method for calculating the internal pressure of the upper section of the steam generator of the nuclear power plant according to claim 1, wherein the obtaining of the first absolute pressure value of the pressure taking point of the pressure measuring instrument specifically includes:
obtaining a pressure measurement value P measured by the pressure measuring instrumentMP.g；
According to the ambient atmospheric pressure PAtmosphere (es)For the pressure measured value PMP.gCorrecting to obtain absolute pressure value P of the pressure measuring instrumentMP.a(ii) a Wherein, PMP.a＝PMP.g+PAtmosphere (es)；
Obtaining a height difference H between the pressure measuring instrument and a pressure point thereof1And the fluid density rho in the pressure measuring pipe of the pressure measuring instrument1；
According to the absolute pressure value PMP.aThe height difference H1And fluid density ρ1Calculating and obtaining a first absolute pressure value P of a pressure taking point of the pressure measuring instrument2.a(ii) a Wherein, P2.a＝PMP.a+ρ1gH1。
3. The method for calculating the internal pressure of the upper section of the steam generator of the nuclear power plant according to claim 1, wherein the obtaining of the second absolute pressure value of the pressure taking point at the lower end of the flow measuring instrument according to the first absolute pressure value specifically comprises:
acquiring the on-way pressure loss delta P of the main steam pipeline between the lower end pressure taking point of the flow measuring instrument and the pressure taking point of the pressure measuring instrumentL2；
According to the on-way pressure loss delta P of the main steam pipelineL2And a first absolute pressure value P2.aCalculating and obtaining a second absolute pressure value P of the lower end pressure taking point of the flow measuring instrument3.a(ii) a Wherein, P3.a＝P2.a+ΔPL2。
4. The method for calculating the internal pressure of the upper section of the steam generator of the nuclear power plant according to claim 1, wherein the obtaining of the third absolute pressure value of the upper pressure taking point of the flow meter according to the second absolute pressure value and the flow value measured by the flow meter specifically comprises:
acquiring a flow value measured by the flow measuring instrument;
calculating the differential pressure value at two ends of the flow measuring instrument reversely according to the flow value;
and correcting the height difference of the pipeline for the second absolute pressure value, and combining the differential pressure value to obtain a third absolute pressure value of the upper end pressure taking point of the flow measuring instrument.
5. The method for calculating the internal pressure of the upper section of the steam generator of the nuclear power plant according to claim 4, wherein the step of performing a pipeline height difference correction on the second absolute pressure value and combining the differential pressure value to obtain a third absolute pressure value of an upper pressure taking point of the flow measuring instrument specifically comprises:
obtaining a height difference H between the flowmeter and a lower end pressure point thereof2Height difference H between the flow meter and the upper end pressure taking point thereof3And the density rho of the fluid in the pressure pipe at the lower end of the flow measuring instrument2And the density rho of the fluid in the pressure taking pipe at the upper end of the flow measuring instrument3；
According to the height difference H2Height difference H3Fluid density ρ2Fluid density ρ3A second absolute pressure value P3.aAnd differential pressure value Δ PMDCalculating and obtaining a third absolute pressure value P of an upper end pressure taking point of the flow measuring instrument1.a(ii) a Wherein, P1.a＝P3.a+ΔPMD+ρ2gH2+ρ3gH3。
6. A calculation system for internal pressure of an upper section of a steam generator of a nuclear power plant is characterized in that a pressure measuring instrument and a flow measuring instrument are arranged at an outlet of the steam generator, a pressure taking point of the pressure measuring instrument is positioned on a main steam pipeline at the outlet of the steam generator, an upper end pressure taking point of the flow measuring instrument is positioned at the upper section of the steam generator, and a lower end pressure taking point of the flow measuring instrument is positioned on the main steam pipeline;
the computing system includes:
the first absolute pressure value acquisition module is used for acquiring a first absolute pressure value of a pressure taking point of the pressure measuring instrument;
the second absolute pressure value acquisition module is used for acquiring a second absolute pressure value of a lower end pressure taking point of the flow measuring instrument according to the first absolute pressure value;
and the upper section internal pressure value acquisition module is used for acquiring a third absolute pressure value of an upper end pressure taking point of the flow measuring instrument according to the second absolute pressure value and the flow value measured by the flow measuring instrument, and taking the third absolute pressure value as the upper section internal pressure value of the steam generator.
7. The system for calculating the internal pressure of the upper section of the steam generator of the nuclear power plant according to claim 6, wherein the first absolute pressure value obtaining module specifically comprises:
a pressure measurement value acquisition unit for acquiring the pressure measurement value P measured by the pressure measurement instrumentMP.g；
An atmospheric pressure correction unit for correcting the atmospheric pressure P according to the ambient atmospheric pressureAtmosphere (es)For the pressure measured value PMP.gCorrecting to obtain absolute pressure value P of the pressure measuring instrumentMP.a(ii) a Wherein, PMP.a＝PMP.g+PAtmosphere (es)；
A data acquisition unit for acquiring the height difference H between the pressure measuring instrument and the pressure point1And the fluid density rho in the pressure measuring pipe of the pressure measuring instrument1；
A first absolute pressure value calculation unit for calculating the absolute pressure value PMP.aThe height difference H1And fluid density ρ1Calculating to obtain the first pressure point of the pressure measuring instrumentAn absolute pressure value P2.a(ii) a Wherein, P2.a＝PMP.a+ρ1gH1。
8. The system for calculating the internal pressure of the upper steam generator section of the nuclear power plant according to claim 6, wherein the second absolute pressure value obtaining module specifically comprises:
a pressure loss obtaining unit for obtaining the on-way pressure loss delta P of the main steam pipeline between the pressure taking point of the lower end of the flow measuring instrument and the pressure taking point of the pressure measuring instrumentL2；
A second absolute pressure value calculation unit for calculating a second absolute pressure value according to the on-way pressure loss Delta P of the main steam pipelineL2And a first absolute pressure value P2.aCalculating and obtaining a second absolute pressure value P of the lower end pressure taking point of the flow measuring instrument3.a(ii) a Wherein, P3.a＝P2.a+ΔPL2。
9. The system for calculating the internal pressure of the upper section of the nuclear power plant steam generator of claim 6, wherein the upper section internal pressure value obtaining module specifically comprises:
a flow value acquisition unit for acquiring a flow value measured by the flow meter;
the differential pressure value calculating unit is used for back calculating the differential pressure value at the two ends of the flow measuring instrument according to the flow value;
and the pipeline height correction unit is used for correcting the pipeline height difference of the second absolute pressure value and obtaining a third absolute pressure value of the upper end pressure taking point of the flow measuring instrument by combining the differential pressure value.
10. The system for calculating the internal pressure of the upper steam generator section of a nuclear power plant of claim 9, wherein the tube height correction unit comprises:
a data acquisition subunit for acquiring the height difference H between the flowmeter and the pressure point at the lower end thereof2Flow meter andheight difference H between upper end pressure taking points3And the density rho of the fluid in the pressure pipe at the lower end of the flow measuring instrument2And the density rho of the fluid in the pressure taking pipe at the upper end of the flow measuring instrument3；
A third absolute pressure value calculating operator unit for calculating the height difference H2Height difference H3Fluid density ρ2Fluid density ρ3A second absolute pressure value P3.aAnd differential pressure value Δ PMDCalculating and obtaining a third absolute pressure value P of an upper end pressure taking point of the flow measuring instrument1.a(ii) a Wherein, P1.a＝P3.a+ΔPMD+ρ2gH2+ρ3gH3。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810834105.5A CN109029829B (en) | 2018-07-26 | 2018-07-26 | Method and system for calculating internal pressure of upper section of steam generator of nuclear power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810834105.5A CN109029829B (en) | 2018-07-26 | 2018-07-26 | Method and system for calculating internal pressure of upper section of steam generator of nuclear power plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109029829A CN109029829A (en) | 2018-12-18 |
| CN109029829B true CN109029829B (en) | 2020-07-17 |
Family
ID=64646615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810834105.5A Active CN109029829B (en) | 2018-07-26 | 2018-07-26 | Method and system for calculating internal pressure of upper section of steam generator of nuclear power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109029829B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109507372B (en) * | 2018-12-21 | 2023-10-20 | 核动力运行研究所 | Steam humidity measurement system and method for steam generator |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2164548Y (en) * | 1992-03-11 | 1994-05-11 | 王颖 | Steam measurer |
| JPH10153533A (en) * | 1996-11-25 | 1998-06-09 | Hakuto Co Ltd | Condensed liquid sampling apparatus, and condensed liquid sampling method using the same |
| CN1274162A (en) * | 2000-06-21 | 2000-11-22 | 北京和利时系统工程股份有限公司 | Method for measuring power of pressurized-water reactor core for nuclear power station |
| KR20010074439A (en) * | 1998-03-04 | 2001-08-04 | 추후제출 | Method and Device for Measuring Pressure inside a Steam Generator |
| CN102252723B (en) * | 2011-04-18 | 2012-11-14 | 清华大学 | System and method for directly measuring total helium mass flow rate of primary loop of high-temperature gas cooled reactor |
| CN104198326A (en) * | 2014-09-05 | 2014-12-10 | 中国核动力研究设计院 | Flowing wet steam wetness measuring system and method |
| CN104316115A (en) * | 2014-11-11 | 2015-01-28 | 国家电网公司 | Method for measuring pipeline flow by use of pipeline pressure drop |
| CN105788681A (en) * | 2016-05-06 | 2016-07-20 | 上海核工程研究设计院 | Main steam pipeline leakage monitoring system of nuclear power station |
| CN106767120A (en) * | 2016-12-12 | 2017-05-31 | 中广核工程有限公司 | Nuclear power plant discloses waters system heat exchanger pressure difference alarm method and device |
| CN107293340A (en) * | 2017-06-28 | 2017-10-24 | 西安交通大学 | A kind of small-sized steam generator thermal hydraulic analysis pilot system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2210169A (en) * | 1987-09-21 | 1989-06-01 | British Gas Plc | Apparatus for monitoring or measuring differential fluid presure |
| AU2004325253B2 (en) * | 2004-11-30 | 2010-07-22 | Micro Motion, Inc. | Method and apparatus for determining flow pressure using density information |
| KR20080056816A (en) * | 2006-12-19 | 2008-06-24 | 재단법인 포항산업과학연구원 | Method and appratus for estimating amount of flow using difference of input and output pressure |
| KR20090012914A (en) * | 2007-07-31 | 2009-02-04 | (주)필로소피아 | A control valve flow characteristic testing method for a generator turbine and an apparatus thereof |
| CN202501948U (en) * | 2012-01-12 | 2012-10-24 | 广东出入境检验检疫局检验检疫技术中心 | Comprehensive test instrument used for testing the hydraulic system pipeline pressure and flow rate |
| CN103091027B (en) * | 2013-01-14 | 2015-07-22 | 上海理工大学 | Liquid pipeline equipment flowing pressure loss tester and testing method |
| CN107731324B (en) * | 2017-10-31 | 2019-07-23 | 中广核工程有限公司 | A kind of nuclear power station unit station thermal performance test summer operating mode simulation system and method |
-
2018
- 2018-07-26 CN CN201810834105.5A patent/CN109029829B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2164548Y (en) * | 1992-03-11 | 1994-05-11 | 王颖 | Steam measurer |
| JPH10153533A (en) * | 1996-11-25 | 1998-06-09 | Hakuto Co Ltd | Condensed liquid sampling apparatus, and condensed liquid sampling method using the same |
| KR20010074439A (en) * | 1998-03-04 | 2001-08-04 | 추후제출 | Method and Device for Measuring Pressure inside a Steam Generator |
| CN1274162A (en) * | 2000-06-21 | 2000-11-22 | 北京和利时系统工程股份有限公司 | Method for measuring power of pressurized-water reactor core for nuclear power station |
| CN102252723B (en) * | 2011-04-18 | 2012-11-14 | 清华大学 | System and method for directly measuring total helium mass flow rate of primary loop of high-temperature gas cooled reactor |
| CN104198326A (en) * | 2014-09-05 | 2014-12-10 | 中国核动力研究设计院 | Flowing wet steam wetness measuring system and method |
| CN104316115A (en) * | 2014-11-11 | 2015-01-28 | 国家电网公司 | Method for measuring pipeline flow by use of pipeline pressure drop |
| CN105788681A (en) * | 2016-05-06 | 2016-07-20 | 上海核工程研究设计院 | Main steam pipeline leakage monitoring system of nuclear power station |
| CN106767120A (en) * | 2016-12-12 | 2017-05-31 | 中广核工程有限公司 | Nuclear power plant discloses waters system heat exchanger pressure difference alarm method and device |
| CN107293340A (en) * | 2017-06-28 | 2017-10-24 | 西安交通大学 | A kind of small-sized steam generator thermal hydraulic analysis pilot system |
Non-Patent Citations (1)
| Title |
|---|
| 压水堆核电站主蒸汽湿度的示踪剂法测量;李志勇等;《产业与科技论坛》;20160731;第15卷(第7期);89-90 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109029829A (en) | 2018-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101825502B (en) | Effluent and drain temperature measurement and calculation method of heater with drain cooler on steam turbine | |
| CN201034966Y (en) | Testing device of mobile on-line pH measuring instrument | |
| CN102252723B (en) | System and method for directly measuring total helium mass flow rate of primary loop of high-temperature gas cooled reactor | |
| CN203376111U (en) | Online calibration device used for pressure gauge for petroleum drilling operation | |
| CN109029829B (en) | Method and system for calculating internal pressure of upper section of steam generator of nuclear power plant | |
| CN109147971B (en) | Verification method of nuclear power plant reactor core water level monitoring system | |
| CN105547406A (en) | Measuring system and measuring method for water level of nuclear power plant steam generator | |
| CN106052968A (en) | Method for positioning leak points of helium mass spectrometer leak detection device for heat-transfer pipe of nuclear steam generator | |
| CN110208328A (en) | A kind of Test of accuracy system and method for the online pH table of power plant water-steam system | |
| CN109884263A (en) | A kind of dissolved oxygen sensor experimental rig and its test method | |
| CN110361077A (en) | A kind of flow and air velocity transducer calibration device and Calibration Method | |
| CN114838867B (en) | Nuclear grade equipment pressure instrument online checking device and checking, correcting and monitoring method | |
| CN106289372A (en) | Welded insulated gas cylinder Daily boil-off-rate measuring instrument method of testing | |
| CN205940855U (en) | Desulfurizing slurry density measurement system's pressure measuring equipment in power plant's desulfurization prewashing tower | |
| CN105716682B (en) | Biogas engineering gas production rate test system | |
| CN112629602B (en) | Condenser and vacuum system air leakage flow measurement method | |
| CN108613772A (en) | The off-line calibration method of nuclear power station differential pressure transmitter | |
| CN213842325U (en) | Natural gas testing and verification integrated system | |
| CN211476790U (en) | Horizontal high pressure feed water heater heat exchange efficiency on-line monitoring system | |
| CN108397574B (en) | Anti-contamination isolation valve for metering standard device of nuclear power plant and use method of anti-contamination isolation valve | |
| CN110749642A (en) | Tracer element concentration detection method for steam generator humidity measurement test | |
| CN206788088U (en) | A kind of boiler flyash carbon content on-line measurement device | |
| CN105651953A (en) | Calibration device for gauge for dissolved hydrogen in water and calibration method thereof | |
| CN111397679A (en) | Main steam flow measuring device of nuclear power plant and measuring method thereof | |
| CN110987498B (en) | Horizontal high-pressure heater heat exchange efficiency online monitoring system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |