CN112050903A - Guided wave radar liquid level meter steam compensation method and device - Google Patents
Guided wave radar liquid level meter steam compensation method and device Download PDFInfo
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- CN112050903A CN112050903A CN202010825312.1A CN202010825312A CN112050903A CN 112050903 A CN112050903 A CN 112050903A CN 202010825312 A CN202010825312 A CN 202010825312A CN 112050903 A CN112050903 A CN 112050903A
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- liquid level
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- steam
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- 239000007788 liquid Substances 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000000926 separation method Methods 0.000 abstract description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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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
- G01F23/22—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
-
- 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
- G01F23/80—Arrangements for signal processing
- G01F23/802—Particular electronic circuits for digital processing equipment
- G01F23/804—Particular electronic circuits for digital processing equipment containing circuits handling parameters other than liquid level
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention relates to the field of nuclear instruments, in particular to a method and a device for compensating steam of a guided wave radar liquid level meter. The invention discloses a steam compensation method of a guided wave radar liquid level meter, which comprises the following steps: measuring by using a guided wave radar liquid level meter to obtain a measured liquid level value in the moisture separator reheater; measuring the temperature in a moisture separator reheater to obtain the relative speed value of the electromagnetic wave in the saturated steam at the temperature; and calculating and compensating the measured liquid level value by using the relative speed value to obtain an actual liquid level value. According to the invention, the speed coefficient of the electromagnetic wave under the working condition is calculated by measuring the steam temperature in the steam-water separator reheater, the measurement data of the guided wave radar is compensated, and the actual liquid level is accurately measured. Test results show that after the guide wave radar liquid level meter steam compensation method and the guide wave radar liquid level meter steam compensation device are adopted, the liquid level measurement precision of a steam-water separation reheater of a unit is within 10mm, and the precision of high-temperature and high-pressure liquid level measurement of other units in the nuclear power industry is far beyond about 100 mm.
Description
Technical Field
The invention relates to the field of nuclear instruments, in particular to a method and a device for compensating steam of a guided wave radar liquid level meter.
Background
As a new liquid level meter, the guided wave radar liquid level meter overcomes the defects of the traditional meter principle and is gradually applied to power plants. The guided wave radar is a product combining a non-contact radar and a guided wave antenna, and the instrument transmits electromagnetic wave signals to a guided wave body which is used as a transmission medium of the signals. When the electromagnetic wave is transmitted to the surface of the measured medium, part of the pulse is reflected to form an echo, and the distance between the transmitting device and the measured liquid level is in direct proportion to the pulse propagation time.
Because the electromagnetic wave speed can be different according to the difference of the dielectric constant in the measuring environment, in the high-temperature and high-pressure steam measuring environment, in order to reduce the influence of steam on the electromagnetic wave speed, the traditional steam compensation technology adds a steam compensation target at a fixed position of a guided wave radar rod, and calculates the real speed of the electromagnetic wave according to the time from the electromagnetic wave to the steam compensation target. In practical engineering application, the internal temperature and pressure of the tank to be measured can change along with the change of the operation condition. At the moment, the saturated steam is easy to condense the condensed water, and the condensed water is attached to the guided wave radar rod, so that the steam compensation and the actual deviation can occur, and the liquid level measurement distortion is further caused. The generated liquid level deviation sometimes reaches 100-200mm, and the stable operation of the unit is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method and the device for steam compensation of the guided wave radar liquid level meter solve the problem that saturated steam condensation influences steam compensation of the guided wave radar liquid level meter when working conditions change, improve accuracy of liquid level measurement and guarantee running safety of a unit.
The invention provides a steam compensation method of a guided wave radar liquid level meter, which comprises the following steps of:
step S1: measuring by using a guided wave radar liquid level meter to obtain a measured liquid level value in the moisture separator reheater;
step S2: measuring the temperature in a moisture separator reheater to obtain the relative speed value of the electromagnetic wave in the saturated steam at the temperature;
step S3: and calculating and compensating the measured liquid level value by using the relative speed value to obtain an actual liquid level value.
Preferably, when calculating the compensation, the steam compensation formula is as follows:
L＇＝X-(X–L)*k
wherein, L' is the liquid level value after compensation, L is the instrument measurement liquid level value before compensation, k represents the relative speed of the electromagnetic wave in the saturated steam under the corresponding temperature, and X is the total length of the waveguide rod.
Preferably, the total length of the waveguide rod is 1900 mm.
Preferably, the liquid level measurement range of the guided wave radar liquid level meter is 0-1600 mm, the working temperature of the guided wave radar liquid level meter is 282 ℃ at most, and the measurement media are saturated steam and saturated water.
The invention provides a steam compensation device of a guided wave radar liquid level meter, which comprises a steam-water separation reheater and the guided wave radar liquid level meter, and also comprises: a temperature measuring element connected with the moisture separator reheater,
and the nuclear power station digital instrument control system is used for receiving the information of the guided wave radar liquid level meter and the temperature measuring element and calculating the information.
Preferably, the bottom of the wave guide rod of the guided wave radar liquid level meter is aligned with a liquid level zero point.
Preferably, the steam compensation function of the guided wave radar liquid level meter is closed.
Preferably, the temperature measuring element is a thermocouple.
Compared with the prior art, the method and the device have the advantages that the speed coefficient of the electromagnetic wave under the working condition is calculated by measuring the steam temperature in the steam-water separator reheater, the measurement data of the guided wave radar are compensated, and the actual liquid level is accurately measured. Test results show that after the guide wave radar liquid level meter steam compensation method and the guide wave radar liquid level meter steam compensation device are adopted, the liquid level measurement precision of a steam-water separation reheater of a unit is within 10mm, and the precision of high-temperature and high-pressure liquid level measurement of other units in the nuclear power industry is far beyond about 100 mm.
Drawings
FIG. 1 shows a schematic structural diagram of a vapor compensation device of a guided wave radar liquid level meter.
Detailed Description
For a further understanding of the invention, embodiments of the invention are described below in conjunction with the examples, but it should be understood that these descriptions are included merely to further illustrate features and advantages of the invention, and are not intended to limit the invention.
The embodiment of the invention discloses a steam compensation method of a guided wave radar liquid level meter, which comprises the following steps:
step S1: measuring by using a guided wave radar liquid level meter to obtain a measured liquid level value in the moisture separator reheater;
step S2: measuring the temperature in a moisture separator reheater to obtain the relative speed value of the electromagnetic wave in the saturated steam at the temperature;
step S3: and calculating and compensating the measured liquid level value by using the relative speed value to obtain an actual liquid level value.
The wave velocity of electromagnetic waves in a cable is related to the insulating medium of the cable. Irrespective of the material and cross-sectional area of the conductor core. The wave velocity expression:
in the formula: c is the propagation velocity of light in vacuum (3.0X 10)8m/s)，rIs the dielectric constant of a gas phase medium.
According to the formula, the wave velocity is determined by the dielectric constant of the gas phase medium. In a steam-water separation reheater system of a nuclear power plant, media are saturated water and saturated steam, and the working condition of the saturated steam can be determined through the temperature of the steam.
The core of the steam compensation method is to calculate the speed coefficient of the electromagnetic wave under the working condition by measuring the steam temperature in the steam-water separator reheater, compensate the measurement data of the guided wave radar and realize the accurate measurement of the actual liquid level.
Preferably, when calculating the compensation, the steam compensation formula is as follows:
L＇＝X-(X–L)*k
wherein, L' is the liquid level value after compensation, L is the instrument measurement liquid level value before compensation, k represents the relative speed of the electromagnetic wave in the saturated steam under the corresponding temperature, and X is the total length of the waveguide rod.
Preferably, the total length of the waveguide rod is 1900 mm.
The liquid level measurement range of the guided wave radar liquid level meter is 0-1600 mm, the working temperature of the guided wave radar liquid level meter is 282 ℃ at most, and measurement media are saturated steam and saturated water.
The relative velocity value of the electromagnetic wave can be calculated according to the dielectric constant of the steam at different temperatures.
| Temperature of | Dielectric constant | Relative speed value (k) |
| 60 | 1.001 | 1 |
| 100 | 1.006 | 0.997 |
| 140 | 1.017 | 0.991 |
| 180 | 1.047 | 0.977 |
| 220 | 1.099 | 0.954 |
| 240 | 1.140 | 0.937 |
| 260 | 1.180 | 0.921 |
| 280 | 1.282 | 0.883 |
| 282 | 1.292 | 0.880 |
The embodiment of the invention also discloses a steam compensation device of the guided wave radar liquid level meter, and particularly relates to a steam compensation device of the guided wave radar liquid level meter, which comprises a steam-water separator reheater 1 and a guided wave radar liquid level meter 2, and further comprises: a temperature measuring element 3 connected with the moisture separator reheater,
and the nuclear power station digital instrument control system 4 is used for receiving the information of the guided wave radar liquid level meter and the temperature measuring element and calculating to obtain an actual liquid level value.
Preferably, the bottom of the wave guide rod of the guided wave radar liquid level meter is aligned with a liquid level zero point.
The temperature measuring element is preferably a thermocouple.
And if the guided wave radar liquid level meter has the steam compensation function, the steam compensation function of the guided wave radar liquid level meter is closed.
For the VEGAFLEX director radar level gauge, the shut down method is as follows:
1) pressing an OK key on the gauge head of the liquid level meter to enter a debugging interface;
2) pressing the triangle key, moving the cursor to enter the menu: extended adjustments- > Additional adjustments- > Special parameter;
3) inputting SW and pressing OK key;
4) moving the cursor to SP28, modifying to 'OFF', pressing OK key to complete;
5) and exiting according to the ESC and ending.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. 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 (8)
1. A steam compensation method of a guided wave radar liquid level meter is characterized by comprising the following steps:
step S1: measuring by using a guided wave radar liquid level meter to obtain a measured liquid level value in the moisture separator reheater;
step S2: measuring the temperature in a moisture separator reheater to obtain the relative speed value of the electromagnetic wave in the saturated steam at the temperature;
step S3: and calculating and compensating the measured liquid level value by using the relative speed value to obtain an actual liquid level value.
2. The guided wave radar level gauge steam compensation method of claim 1, wherein in the calculation of the compensation, the steam compensation formula is as follows:
L＇＝X-(X–L)*k
wherein, L' is the liquid level value after compensation, L is the instrument measurement liquid level value before compensation, k represents the relative speed of the electromagnetic wave in the saturated steam under the corresponding temperature, and X is the total length of the waveguide rod.
3. The guided wave radar level gauge steam compensation method of claim 2, wherein the total length of the guided wave rod is 1900 mm.
4. The steam compensation method of the guided wave radar liquid level meter according to claim 1, wherein the liquid level measurement range of the guided wave radar liquid level meter is 0-1600 mm, the working temperature of the guided wave radar liquid level meter is 282 ℃ at most, and the measurement media are saturated steam and saturated water.
5. The utility model provides a steam compensation arrangement of guided wave radar level gauge, includes moisture separator reheater (1) and guided wave radar level gauge (2), its characterized in that still includes: a temperature measuring element (3) connected with the moisture separator reheater,
and the nuclear power station digital instrument control system (4) is used for receiving the information of the guided wave radar liquid level meter and the temperature measuring element and calculating the information.
6. The guided wave radar level gauge steam compensation device of claim 5, wherein a guided wave rod bottom of the guided wave radar level gauge is aligned with a level zero.
7. The guided wave radar level gauge steam compensation device of claim 5, wherein the guided wave radar level gauge steam compensation function is turned off.
8. The guided wave radar level gauge vapor compensation device of claim 5, wherein the temperature measuring element is a thermocouple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010825312.1A CN112050903A (en) | 2020-08-17 | 2020-08-17 | Guided wave radar liquid level meter steam compensation method and device |
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| CN202010825312.1A CN112050903A (en) | 2020-08-17 | 2020-08-17 | Guided wave radar liquid level meter steam compensation method and device |
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Citations (9)
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|---|---|---|---|---|
| JPH03210427A (en) * | 1990-01-16 | 1991-09-13 | Toshiba Corp | Apparatus for measuring level of hot fluid |
| CN201034693Y (en) * | 2007-05-30 | 2008-03-12 | 黄樟焱 | Device detecting water level and water temperature |
| CN101315295A (en) * | 2007-05-30 | 2008-12-03 | 黄樟焱 | Method and device for detecting water level and water temperature |
| CN101408450A (en) * | 2007-10-10 | 2009-04-15 | 罗明 | Full operating condition continuous measuring boiler drum liquid-level meter and liquid level computation method thereof |
| CN203455057U (en) * | 2013-08-21 | 2014-02-26 | 天津津滨石化设备有限公司 | Electromagnetic wave checking device of radar liquid level meter |
| CN103782138A (en) * | 2011-09-08 | 2014-05-07 | 贝科技术有限公司 | Fill level monitoring |
| CN104596615A (en) * | 2015-01-30 | 2015-05-06 | 高峰 | Device for measuring liquid level position of high-temperature liquid |
| CN107884035A (en) * | 2016-09-30 | 2018-04-06 | 罗斯蒙特储罐雷达股份公司 | Radar level gauge system and the method for determining the interface material position in storage tank |
| CN109489772A (en) * | 2011-09-06 | 2019-03-19 | 斯塔米卡邦有限公司 | Radar level gauging |
-
2020
- 2020-08-17 CN CN202010825312.1A patent/CN112050903A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03210427A (en) * | 1990-01-16 | 1991-09-13 | Toshiba Corp | Apparatus for measuring level of hot fluid |
| CN201034693Y (en) * | 2007-05-30 | 2008-03-12 | 黄樟焱 | Device detecting water level and water temperature |
| CN101315295A (en) * | 2007-05-30 | 2008-12-03 | 黄樟焱 | Method and device for detecting water level and water temperature |
| CN101408450A (en) * | 2007-10-10 | 2009-04-15 | 罗明 | Full operating condition continuous measuring boiler drum liquid-level meter and liquid level computation method thereof |
| CN109489772A (en) * | 2011-09-06 | 2019-03-19 | 斯塔米卡邦有限公司 | Radar level gauging |
| CN103782138A (en) * | 2011-09-08 | 2014-05-07 | 贝科技术有限公司 | Fill level monitoring |
| CN203455057U (en) * | 2013-08-21 | 2014-02-26 | 天津津滨石化设备有限公司 | Electromagnetic wave checking device of radar liquid level meter |
| CN104596615A (en) * | 2015-01-30 | 2015-05-06 | 高峰 | Device for measuring liquid level position of high-temperature liquid |
| CN107884035A (en) * | 2016-09-30 | 2018-04-06 | 罗斯蒙特储罐雷达股份公司 | Radar level gauge system and the method for determining the interface material position in storage tank |
Non-Patent Citations (1)
| Title |
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