CN106768159B - Nuclear power station reactor core liquid level detector - Google Patents
Nuclear power station reactor core liquid level detector Download PDFInfo
- Publication number
- CN106768159B CN106768159B CN201710107472.0A CN201710107472A CN106768159B CN 106768159 B CN106768159 B CN 106768159B CN 201710107472 A CN201710107472 A CN 201710107472A CN 106768159 B CN106768159 B CN 106768159B
- Authority
- CN
- China
- Prior art keywords
- armored
- thermocouple
- liquid level
- pressure
- bearing sleeve
- 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.)
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- 239000007788 liquid Substances 0.000 title claims abstract description 45
- 238000010438 heat treatment Methods 0.000 claims abstract description 39
- 238000005259 measurement Methods 0.000 claims abstract description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 8
- 230000004323 axial length Effects 0.000 claims abstract description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 229910000943 NiAl Inorganic materials 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/04—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples the object to be measured not forming one of the thermoelectric materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
Abstract
A liquid level detector for a reactor core of a nuclear power station is characterized by comprising a pressure-bearing sleeve, an armored heating cable, an armored thermocouple, nickel powder and Al 2 O 3 Powder, wherein the pressure-bearing sleeve comprises an armored thermocouple, an N (N is more than or equal to 2) branch heated armored thermocouple and an armored heating cable comprising N (N is more than or equal to 2) section heating resistance wires, the armored thermocouple is positioned at the bottom of the pressure-bearing sleeve, compacted nickel powder is filled in the axial length area of the N section heating resistance wires, and compacted Al is filled in the other axial areas 2 O 3 The powder, the armoured thermocouple and the armoured thermocouple at the heating part form a thermocouple measuring pair for measuring the liquid level. The liquid level measuring device not only increases the sensitivity of liquid level measurement, but also improves the anti-interference capability of measurement.
Description
Technical Field
The invention relates to a heating type thermocouple liquid level sensor, in particular to a sensor for measuring the temperature and the liquid level of a reactor core of a nuclear power station.
Background
At present, liquid level sensors used in occasions requiring high reliability, such as pressure vessels of pressurized water reactor nuclear power plants and high-temperature and high-pressure boilers or liquid reservoirs of thermal power plants mostly adopt differential pressure type liquid level meters, float liquid level meters, magnetic liquid level meters, transparent glass tubes (plates) and other liquid level meters, and some of the liquid level meters belong to indirect measurement, and some of the liquid level meters are low in reliability and some of the liquid level meters are short in service life. The reliability of the liquid level measurement in the occasions with high reliability requirements is directly related to the safety and personal safety of production equipment, so that a high-reliability device capable of directly monitoring the liquid level in a pressure-bearing container is urgently needed. In addition, (1) the existing hot-end heating thermocouple liquid level meter is used for monitoring single-point liquid level and is used for multi-point liquid level monitoring, a plurality of hot-end heating thermocouple liquid level meters are required to be arranged, the defects of large volume and large through holes in the container wall exist, and (2) the existing segmented heating thermocouple liquid level sensor has the advantages of small volume and large measuring points, but has the defects of difficult positioning of accurate positions of segmented resistance wires and differential thermocouple measuring points in a sleeve and poor MgO heat conduction.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the reactor core liquid level detector of the nuclear power station reactor in order to overcome the defects in the prior art, so that the detector can directly, accurately and quickly monitor the liquid level of a medium in a container, and is more suitable for being used in occasions with requirements on nuclear fields and high reliability.
The technical scheme adopted for solving the technical problems is as follows:
a liquid level detector for a reactor core of a nuclear power station is characterized by comprising a pressure-bearing sleeve, an armored heating cable, an armored thermocouple, nickel powder and Al 2 O 3 Powder, wherein the pressure-bearing sleeve comprises an armored thermocouple, an N (N is more than or equal to 2) branch heated armored thermocouple and an armored heating cable comprising N (N is more than or equal to 2) section heating resistance wires, the armored thermocouple is positioned at the bottom of the pressure-bearing sleeve, compacted nickel powder is filled in the axial length area of the N section heating resistance wires, and compacted Al is filled in the other axial areas 2 O 3 The powder, the armoured thermocouple and the armoured thermocouple at the heating part form a thermocouple measuring pair for measuring the liquid level.
The bottom sheathed thermocouple measures the core coolant outlet temperature and is also the reference point for liquid level measurement. The N-branch heating armoured thermocouple is a sensitive element for measuring the liquid level, the measuring points of the N-branch heating armoured thermocouple are at the same height as the center of N-section resistance wires in the U-shaped armoured heating cable, heat on the N-section heating resistance wires is transferred to an environment medium outside the pressure-bearing sleeve through nickel powder in the pressure-bearing sleeve and the wall of the pressure-bearing sleeve, and the temperature measured by the heating armoured thermocouple in the nickel powder section reflects whether the environment medium outside the pressure-bearing sleeve at the measuring points is liquid phase or vapor/gas phase due to obvious difference of heat transfer performance of the liquid phase and vapor/gas phase medium, so that the position of the liquid level can be determined. The distance between the N sections of heating resistance wires represents the mutual liquid level height difference, and the liquid level height can be known by outputting the quantity of low level of the thermal potential difference value delta E from the reference point of liquid level measurement and the heated armoured thermocouple by means of the physical installation position.
And better, the measuring points of the N heated armored thermocouples are equal to the central positions of the N sections of heating resistance wires, so that the measurement is more accurate.
And preferably, the upper end of the pressure-bearing sleeve is also provided with another armored thermocouple which is also used as a reference point for measuring the liquid level, and the armored thermocouple at the heating position forms a thermocouple measuring pair for measuring the liquid level.
And preferably, a thermal resistance thermometer is further arranged in the cold end packaging tube of the pressure-bearing sleeve, and the cold end compensation temperature of the armored thermocouple is provided through the thermal resistance thermometer, so that the temperature of a medium can be measured by the unheated armored thermocouple at the bottom of the pressure-bearing sleeve under the condition that a compensation wire is not used. In addition, for the working condition that the temperature of the measured medium is higher than the ambient temperature, if the pressure-bearing sleeve leaks, the measured temperature can be increased, so that whether the pressure-bearing sleeve leaks or not is judged.
Preferably, the thermal resistance thermometer is Pt100, and the temperature measurement accuracy is higher.
Better, above-mentioned armoured thermocouple and the armoured thermocouple of heating correspond one by one, constitute the thermocouple measurement pair of measuring the liquid level, and the liquid level of measurement is more accurate like this.
The invention utilizes the axial sectional heating mode and the structure of filling with the heat and electricity conductive metal nickel powder and the Al2O3 powder at intervals, can effectively increase the non-uniformity of the axial temperature distribution along the surface of the pressure bearing sleeve, namely, N high-low areas are formed along the surface of the pressure bearing sleeve by the axial temperature, thereby increasing the sensitivity of liquid level measurement, and simultaneously, reducing the temperature of the resistance wire, thereby improving the reliability of liquid level measurement. Meanwhile, the metal nickel powder is a conductive medium, so that the pressure-bearing sleeve, the armored thermocouple and the armored heating cable are mutually conducted to form an equipotential body, and the anti-interference capability of measurement is improved.
The invention can also be used for measuring the temperature and the liquid level of the medium in other containers or liquid reservoirs.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
As shown in FIG. 1, a reactor core level detector of a nuclear power plant comprises K-type (NiCr-NiAl) armored thermocouples 2 and 7 (the sleeve material is 316L), 3-branch heated K-type (NiCr-NiAl) armored thermocouples 6 (the sleeve material is 316L and the outer diameter is 1.0 mm) and a U-shaped armored heating cable 5 (the sleeve material is 316L) comprising 3 sections of heating resistance wires (the material is Ni80Cr 20), wherein the compacted heat conduction and electric conduction nickel powder 3 is filled at the axial length position of the 3 sections of heating resistance wires in the pressure-bearing sleeve, and besides the compacted Al is filled 2 O 3 Powder 4. A Pt100 thermal resistance thermometer 8 is arranged in the cold end packaging tube 9 of the pressure-bearing sleeve.
The measuring end of the 3-branch heating armored thermocouple 6 is positioned at the height of the center of the resistance wire of the 3-section armored heating cable 5.
The K-type armored thermocouple 2 is positioned at the bottom of the pressure-bearing sleeve, and the K-type armored thermocouple 7 is positioned at the upper end of the pressure-bearing sleeve.
Claims (1)
1. A nuclear power plant reactor core level detector, characterized by: comprises a pressure-bearing sleeve, an armored heating cable, an armored thermocouple, nickel powder and Al 2 O 3 Powder, wherein the pressure-bearing sleeve comprises an armored thermocouple, N heated armored thermocouples and an armored heating cable comprising N sections of heating resistance wires, N is more than or equal to 2, the armored thermocouple is positioned at the bottom of the pressure-bearing sleeve, compacted nickel powder is filled in the axial length area of the N sections of heating resistance wires, and compacted Al is filled in the other axial areas 2 O 3 The powder, the armoured thermocouple and the armoured thermocouple at the heating position form a thermocouple measuring pair for measuring the liquid level;
the measuring points of the N heated armored thermocouples are equal in height to the center of the N sections of heating resistance wires;
the upper end of the pressure-bearing sleeve is also provided with another armored thermocouple, and the other armored thermocouple and the armored thermocouple at the heating position form a thermocouple measuring pair for measuring the liquid level;
a thermal resistance thermometer is arranged in the cold end packaging tube of the pressure-bearing sleeve;
the thermal resistance thermometer is Pt100;
the armored thermocouples are in one-to-one correspondence with the heated armored thermocouples to form thermocouple measuring pairs for measuring liquid level;
the armored heating cable is U-shaped;
the nickel powder enables the pressure-bearing sleeve, the armored thermocouple and the armored heating cable to be mutually conducted to form an equipotential body, so that the anti-interference capability of measurement is improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710107472.0A CN106768159B (en) | 2017-02-27 | 2017-02-27 | Nuclear power station reactor core liquid level detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710107472.0A CN106768159B (en) | 2017-02-27 | 2017-02-27 | Nuclear power station reactor core liquid level detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106768159A CN106768159A (en) | 2017-05-31 |
| CN106768159B true CN106768159B (en) | 2023-11-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710107472.0A Active CN106768159B (en) | 2017-02-27 | 2017-02-27 | Nuclear power station reactor core liquid level detector |
Country Status (1)
| Country | Link |
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| CN (1) | CN106768159B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111323098A (en) * | 2020-02-28 | 2020-06-23 | 中广核研究院有限公司 | Sensor for measuring water level of reactor core |
| CN113899427A (en) * | 2021-10-14 | 2022-01-07 | 重庆大学 | Partition combined heating type superconducting liquid level meter |
Citations (14)
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|---|---|---|---|---|
| US4440717A (en) * | 1981-09-01 | 1984-04-03 | Combustion Engineering, Inc. | Heated junction thermocouple level measurement apparatus |
| CN87203026U (en) * | 1987-03-08 | 1988-01-20 | 栾文举 | Fully armoved metal thermal resistance |
| US4805454A (en) * | 1986-08-11 | 1989-02-21 | Levert Francis E | Continuous fluid level detector |
| US5167153A (en) * | 1986-04-23 | 1992-12-01 | Fluid Components, Inc. | Method of measuring physical phenomena using a distributed RTD |
| JP2009162487A (en) * | 2007-12-28 | 2009-07-23 | Watty Corp | Induction heating type liquid level sensor |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20140072086A1 (en) * | 2012-09-11 | 2014-03-13 | Ge-Hitachi Nuclear Energy Americas Llc | Method and system for measuring a spent fuel pool temperature and liquid level without external electrical power |
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2017
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Patent Citations (14)
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Address after: Workshop 32, No.68, Yuhai East Road, Hangzhou Bay New District, Ningbo City, Zhejiang Province Applicant after: NINGBO AUQI AUTO-INSTRUMENT EQUIPMENT Co.,Ltd. Address before: Jiangbei District, Zhejiang city of Ningbo Province Dongsheng Street 315020 No. 52 Applicant before: NINGBO AUQI AUTO-INSTRUMENT EQUIPMENT Co.,Ltd. |
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