CN114061695A - Method and system for measuring liquid level of large-volume equipment containing free liquid level under ocean condition - Google Patents
Method and system for measuring liquid level of large-volume equipment containing free liquid level under ocean condition Download PDFInfo
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- 230000001133 acceleration Effects 0.000 claims description 41
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- 238000000691 measurement method Methods 0.000 claims description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The invention discloses a method and a system for measuring the liquid level of large-volume equipment containing free liquid level under ocean conditions, which relate to the technical field of liquid level measurement under ocean conditions, and adopt a liquid level measuring device, and comprise the following steps: s101, arranging sensors on the large-volume equipment and the liquid level measuring device; s201, acquiring a measurement value of the sensor in S101; s301, establishing a mathematical model for eliminating the influence of ocean conditions on the liquid level measurement of the large-volume equipment; and S401, substituting the measured value in S201 into the mathematical model in S301 to obtain a liquid level measured value for eliminating the influence of the ocean conditions. The invention adopts the accelerometer and the inclinometer to obtain the liquid level measurement influence of the ocean condition on the differential pressure liquid level sensor, constructs a mathematical model for eliminating the influence of the ocean condition on the basis of the liquid level measurement influence, and eliminates the influence of the ocean condition on the liquid level measurement of the large volume equipment containing free liquid level from the theory.
Description
Technical Field
The invention relates to the technical field of liquid level measurement under ocean conditions, in particular to a method and a system for measuring the liquid level of large-volume equipment containing free liquid level under ocean conditions.
Background
The nuclear power plant of the ship is provided with equipment with free liquid level, such as a steam generator, a voltage stabilizer and the like, and the free liquid level of the equipment can fluctuate under the ocean condition, so that the liquid level measurement is distorted, and the misoperation of a liquid level control system is further caused. The problem is particularly serious in a steam generator liquid level control system, the steam generator is a key heat exchange device for connecting a first loop and a second loop of a ship nuclear power device, in order to ensure effective heat exchange and the steam quality of the second loop, the liquid level of the steam generator needs to be accurately controlled, the liquid level control performance can be seriously influenced by the liquid level measurement distortion of the steam generator caused by ocean conditions, in addition, the systems of the ship nuclear power device have strong coupling characteristics, the influence can be influenced by a plurality of systems, the ship nuclear power device is in an unstable running state, the safety of a nuclear reactor is threatened, and even nuclear leakage accidents are caused.
Therefore, a method and a system for measuring the liquid level of a large-volume device containing free liquid level under ocean conditions are provided, which solve the problems in the prior art and are urgently needed to be solved by the technical personnel in the field.
Disclosure of Invention
In view of the above, the invention provides a method and a system for measuring the liquid level of large-volume equipment containing free liquid level under ocean conditions, so that the influence of the ocean conditions on the liquid level measurement of the large-volume equipment containing free liquid level is eliminated, and the occurrence of accidents is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for measuring the liquid level of large-volume equipment containing free liquid level under the ocean condition adopts a liquid level measuring device, and comprises the following steps:
s101, arranging sensors on the large-volume equipment and the liquid level measuring device;
s201, acquiring a measurement value of the sensor in S101;
s301, establishing a mathematical model for eliminating the influence of ocean conditions on the liquid level measurement of the large-volume equipment;
and S401, substituting the measured value in S201 into the mathematical model in S301 to obtain a liquid level measured value for eliminating the influence of the ocean conditions.
Optionally, S101 includes the following steps:
s1011, arranging a differential pressure liquid level sensor on the large-volume equipment, and measuring the liquid level corresponding to the differential pressure
S1012, arranging an accelerometer on the liquid level measuring device, and measuring the acceleration of the large-volume equipment in the vertical direction;
and S1013, arranging an inclinometer on the liquid level measuring device, and measuring the inclination angle of the large-volume equipment in the vertical direction.
Optionally, S201 includes the following steps:
s2011, acquiring a liquid level value measured by a differential pressure liquid level sensor;
s2012, acquiring the acceleration measured by the accelerometer;
s2013, obtaining the inclination angle measured by the inclinometer.
Optionally, S301 includes the following steps:
s3011, establishing a first mathematical model for eliminating the influence of acceleration added by ocean conditions on a differential pressure sensor liquid level measured value;
s3012, establishing a second mathematical model for eliminating the influence of the inclination angle added by the ocean condition on the liquid level measured value of the differential pressure sensor.
Optionally, S401 includes the following steps:
s4011, inputting a level value measured by the differential pressure liquid level sensor in S2011 and the acceleration measured by the accelerometer in S2012 into the first mathematical model in S3011 to obtain a liquid level measurement value for eliminating the acceleration influence;
and S4012, substituting the inclination angle measured by the inclinometer in S2013 and the liquid level measurement value with the acceleration influence eliminated in S4011 into the second mathematical model in S3012 to obtain the liquid level measurement value with the ocean condition influence eliminated.
A liquid level measurement system of large-volume equipment containing free liquid level under ocean conditions applies a liquid level measurement method of the large-volume equipment containing the free liquid level under the ocean conditions, and comprises a data acquisition module, a mathematical model building module and a liquid level calculation module which are sequentially connected;
the data acquisition module is used for acquiring the measurement values of the sensors arranged on the large-volume equipment and the liquid level measurement device;
the mathematical model establishing module is used for establishing a mathematical model for eliminating the influence of ocean conditions on the liquid level measurement of the large-volume equipment;
and the liquid level calculation module is used for inputting the measured value of the sensor into the mathematical model to obtain a liquid level measured value for eliminating the influence of the ocean conditions.
Optionally, the measured values of the sensor acquired by the data acquisition module include: the liquid level value measured by the differential pressure liquid level sensor, the acceleration measured by the accelerometer and the inclination angle measured by the inclinometer.
Optionally, the mathematical model established by the mathematical model establishing module includes a first mathematical model and a second mathematical model, wherein the first mathematical model is used for eliminating the influence of the additional acceleration of the ocean condition on the liquid level measurement value of the differential pressure sensor, and the second mathematical model is used for eliminating the influence of the additional inclination angle of the ocean condition on the liquid level measurement value of the differential pressure sensor.
Optionally, the liquid level calculation module inputs a liquid level value measured by the differential pressure liquid level sensor and an acceleration measured by the accelerometer into the first mathematical model to obtain a liquid level measurement value for eliminating the acceleration influence;
and substituting the inclination angle measured by the inclinometer and the liquid level measurement value for eliminating the acceleration influence into a second mathematical model to obtain the liquid level measurement value for eliminating the influence of the ocean conditions.
According to the technical scheme, compared with the prior art, the invention provides a method and a system for measuring the liquid level of large-volume equipment containing free liquid level under the ocean condition, wherein the method comprises the following steps: the method comprises the steps of acquiring the liquid level measurement influence of ocean conditions on a differential pressure liquid level sensor by adopting an accelerometer and an inclinometer, constructing a mathematical model for eliminating the influence of the ocean conditions on the liquid level measurement influence of the ocean conditions on a large-volume device containing free liquid level, and eliminating the influence of the ocean conditions on the liquid level measurement of the large-volume device containing free liquid level from the theory.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method for measuring the liquid level of a large-volume device containing a free liquid level under ocean conditions according to the present invention;
FIG. 2 is a flowchart of the method of S101 in the present invention;
FIG. 3 is a flowchart of the method of S201 in the present invention;
FIG. 4 is a flowchart of the method of S301 in the present invention;
FIG. 5 is a flowchart of the method of S401 in the present invention;
FIG. 6 is a block diagram of a liquid level measurement system for a large volume device with free liquid level under ocean conditions according to the present invention;
FIG. 7 is a schematic structural diagram of a liquid level measuring device of a large-volume apparatus containing free liquid level under ocean conditions according to the present invention;
the device comprises a 1-cylindrical container, a 2-differential pressure liquid level sensor, a 3-accelerometer, a 4-inclinometer, a 5-liquid level measuring device, a 51-first telescopic rod, a 52-second telescopic rod, a 53-first platform, a 54-second platform, a 55-supporting rod and a 56-supporting base.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the invention discloses a method for measuring the liquid level of large-volume equipment containing free liquid level under ocean conditions, which adopts a liquid level measuring device and comprises the following steps:
s101, arranging sensors on the large-volume equipment and the liquid level measuring device;
s201, acquiring a measurement value of the sensor in S101;
s301, establishing a mathematical model for eliminating the influence of ocean conditions on the liquid level measurement of the large-volume equipment;
and S401, substituting the measured value in S201 into the mathematical model in S301 to obtain a liquid level measured value for eliminating the influence of the ocean conditions.
In a specific embodiment, referring to fig. 2, S101 includes the following steps:
s1011, arranging a differential pressure liquid level sensor on the large-volume equipment, arranging one pressure measuring point at the bottom in the large-volume equipment, and arranging the other pressure measuring point above the liquid level of the large-volume equipment to measure the liquid level corresponding to the differential pressure;
s1012, arranging an accelerometer on the liquid level measuring device, and measuring the acceleration of the large-volume equipment in the vertical direction;
and S1013, arranging an inclinometer on the liquid level measuring device, and measuring the inclination angle of the large-volume equipment in the vertical direction.
In a specific embodiment, referring to fig. 3, S201 includes the following steps:
s2011, acquiring a level value measured by the differential pressure liquid level sensor, wherein the unit is m;
s2012, acquiring the acceleration measured by the accelerometer, wherein the unit is m/S2；
S2013, obtaining the inclination angle measured by the inclinometer, wherein the unit is.
In a specific embodiment, referring to fig. 4, S301 includes the following steps:
s3011, establishing a first mathematical model for eliminating the influence of acceleration added by ocean conditions on a differential pressure sensor liquid level measured value;
s3012, establishing a second mathematical model for eliminating the influence of the inclination angle added by the ocean condition on the liquid level measured value of the differential pressure sensor.
In a specific embodiment, the specific content of S3011 is:
1) calculating the gravity acceleration deviation degree deltag: by dividing the acceleration measurement g' by the acceleration of gravity g (at 9.8 m/s)2Calculated), i.e. Δ g ═ g' ÷ g;
2) calculating the liquid level measurement value h after correcting the accelerationa: multiplying the measured value h of the liquid level by the acceleration deviation Δ g calculated in step 1), i.e. ha＝h×Δg。
In a specific embodiment, the specific content of S3012 is:
1) calculating the cosine value of the inclination angle: solving the rest chord values, namely cos (theta), through the dip angle measurement value theta;
2) calculating a liquid level correction value h': the acceleration-corrected liquid level measurement value calculated in S3011 is divided by the tilt cosine value in step 1), i.e., h' ═ ha÷cos(θ)。
In a specific embodiment, referring to fig. 5, S401 includes the following steps:
s4011, inputting a level value measured by the differential pressure liquid level sensor in S2011 and the acceleration measured by the accelerometer in S2012 into the first mathematical model in S3011 to obtain a liquid level measurement value for eliminating the acceleration influence;
and S4012, substituting the inclination angle measured by the inclinometer in S2013 and the liquid level measurement value with the acceleration influence eliminated in S4011 into the second mathematical model in S3012 to obtain the liquid level measurement value with the ocean condition influence eliminated.
In a specific embodiment, the level value measured by the differential pressure liquid level sensor obtained in S201 is 2.0 m; the acceleration measured by the accelerometer is 9.2m/s2(ii) a The inclination angle measured by the inclinometer is 30 degrees;
the specific content of S4011 is:
1) acceleration measurement g ═ 9.2;
2) the gravity acceleration deviation degree delta g is 9.2 ÷ 9.8 ≈ 0.939;
3) the measured liquid level h is 2;
4) corrected acceleration measured liquid level ha＝2×0.939＝1.878；
The specific content of S4012 is:
1) the inclination angle measured value theta is 30 degrees, and the cosine value cos (theta) is approximately equal to 0.866;
2) correction value of liquid level ha＝1.878；
3) The corrected liquid level value h' is 1.878 ÷ 0.866 ≈ 2.169.
Referring to fig. 6, the invention also discloses a large-volume equipment liquid level measurement system containing free liquid level under ocean condition, which applies a large-volume equipment liquid level measurement method containing free liquid level under ocean condition, and comprises a data acquisition module, a mathematical model establishment module and a liquid level calculation module which are connected in sequence;
the data acquisition module is used for acquiring the measurement values of the sensors arranged on the large-volume equipment and the liquid level measurement device;
the mathematical model establishing module is used for establishing a mathematical model for eliminating the influence of ocean conditions on the liquid level measurement of the large-volume equipment;
and the liquid level calculation module is used for inputting the measured value of the sensor into the mathematical model to obtain a liquid level measured value for eliminating the influence of the ocean conditions.
In one embodiment, the sensor measurements acquired by the data acquisition module include: the liquid level value measured by the differential pressure liquid level sensor, the acceleration measured by the accelerometer and the inclination angle measured by the inclinometer.
In a specific embodiment, the mathematical model established by the mathematical model establishing module comprises a first mathematical model and a second mathematical model, wherein the first mathematical model is used for eliminating the influence of the additional acceleration of the ocean condition on the liquid level measurement value of the differential pressure sensor, and the second mathematical model is used for eliminating the influence of the additional inclination angle of the ocean condition on the liquid level measurement value of the differential pressure sensor.
In a specific embodiment, the liquid level calculation module inputs a liquid level value measured by the differential pressure liquid level sensor and an acceleration measured by the accelerometer into the first mathematical model to obtain a liquid level measurement value without acceleration influence;
and substituting the inclination angle measured by the inclinometer and the liquid level measurement value for eliminating the acceleration influence into a second mathematical model to obtain the liquid level measurement value for eliminating the influence of the ocean conditions.
Referring to fig. 7, disclosed is a liquid level measuring device of a large volume equipment with free liquid level under ocean conditions, comprising: two first telescopic rods 51, a second telescopic rod 52, a first platform 53, a second platform 54, a support rod 55 and a support base 56; the two first telescopic rods 51 and the first platform 53 form a fluctuation rack to realize the up-and-down motion of the cylindrical container 1 in the vertical direction; the second telescopic rod 53 and the second platform 54 form a swing rack, so that the angle inclination of the cylindrical container 1 is realized; a support bar 55 and a support base 56 are used to support the measurement structure.
An accelerometer 3 and an inclinometer 4 are arranged on the first platform 53, a differential pressure liquid level sensor is arranged on the cylindrical container 1, one pressure measuring point is arranged at the bottom in the cylindrical container 1, and the other pressure measuring point is arranged above the liquid level of the cylindrical container 1.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention in a progressive manner. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A method for measuring the liquid level of large-volume equipment containing free liquid level under the ocean condition is characterized in that a liquid level measuring device is adopted, and the method comprises the following steps:
s101, arranging sensors on the large-volume equipment and the liquid level measuring device;
s201, acquiring a measurement value of the sensor in S101;
s301, establishing a mathematical model for eliminating the influence of ocean conditions on the liquid level measurement of the large-volume equipment;
and S401, substituting the measured value in S201 into the mathematical model in S301 to obtain a liquid level measured value for eliminating the influence of the ocean conditions.
2. The method for measuring the liquid level of the large-volume equipment with the free liquid level under the ocean condition as claimed in claim 1, wherein S101 comprises the following steps:
s1011, arranging a differential pressure liquid level sensor on the large-volume equipment, and measuring the liquid level corresponding to the differential pressure
S1012, arranging an accelerometer on the liquid level measuring device, and measuring the acceleration of the large-volume equipment in the vertical direction;
and S1013, arranging an inclinometer on the liquid level measuring device, and measuring the inclination angle of the large-volume equipment in the vertical direction.
3. The method for measuring the liquid level of the large-volume equipment with the free liquid level under the ocean condition as claimed in claim 2, wherein S201 comprises the following steps:
s2011, acquiring a liquid level value measured by a differential pressure liquid level sensor;
s2012, acquiring the acceleration measured by the accelerometer;
s2013, obtaining the inclination angle measured by the inclinometer.
4. A method for measuring the level of a large volume device containing a free liquid level under ocean conditions according to claim 3, wherein S301 comprises the steps of:
s3011, establishing a first mathematical model for eliminating the influence of acceleration added by ocean conditions on a differential pressure sensor liquid level measured value;
s3012, establishing a second mathematical model for eliminating the influence of the inclination angle added by the ocean condition on the liquid level measured value of the differential pressure sensor.
5. The method for measuring the liquid level of the large-volume equipment with the free liquid level under the ocean condition as claimed in claim 4, wherein S401 comprises the following steps:
s4011, inputting a level value measured by the differential pressure liquid level sensor in S2011 and the acceleration measured by the accelerometer in S2012 into the first mathematical model in S3011 to obtain a liquid level measurement value for eliminating the acceleration influence;
and S4012, substituting the inclination angle measured by the inclinometer in S2013 and the liquid level measurement value with the acceleration influence eliminated in S4011 into the second mathematical model in S3012 to obtain the liquid level measurement value with the ocean condition influence eliminated.
6. A liquid level measurement system of large-volume equipment containing free liquid level under the ocean condition is characterized in that the liquid level measurement method of the large-volume equipment containing the free liquid level under the ocean condition, which is disclosed by any one of claims 1 to 5, is applied, and comprises a data acquisition module, a mathematical model establishment module and a liquid level calculation module which are connected in sequence;
the data acquisition module is used for acquiring the measurement values of the sensors arranged on the large-volume equipment and the liquid level measurement device;
the mathematical model establishing module is used for establishing a mathematical model for eliminating the influence of ocean conditions on the liquid level measurement of the large-volume equipment;
and the liquid level calculation module is used for inputting the measured value of the sensor into the mathematical model to obtain a liquid level measured value for eliminating the influence of the ocean conditions.
7. A system for measuring the level of a large volume of equipment containing a free liquid surface under ocean conditions according to claim 6,
the measured values of the sensor acquired by the data acquisition module comprise: the liquid level value measured by the differential pressure liquid level sensor, the acceleration measured by the accelerometer and the inclination angle measured by the inclinometer.
8. A system for measuring the level of a large volume of equipment containing a free liquid surface under ocean conditions according to claim 6,
the mathematical model established by the mathematical model establishing module comprises a first mathematical model and a second mathematical model, wherein the first mathematical model is used for eliminating the influence of the additional acceleration of the ocean condition on the liquid level measurement value of the differential pressure sensor, and the second mathematical model is used for eliminating the influence of the additional inclination angle of the ocean condition on the liquid level measurement value of the differential pressure sensor.
9. A system for measuring the level of a large volume of equipment containing a free liquid surface under ocean conditions according to claim 6,
the liquid level calculation module inputs a liquid level value measured by the differential pressure liquid level sensor and the acceleration measured by the accelerometer into the first mathematical model to obtain a liquid level measurement value for eliminating the acceleration influence;
and substituting the inclination angle measured by the inclinometer and the liquid level measurement value for eliminating the acceleration influence into a second mathematical model to obtain the liquid level measurement value for eliminating the influence of the ocean conditions.
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