CN106768159A - A kind of nuclear power station reactor core level sensor - Google Patents
A kind of nuclear power station reactor core level sensor Download PDFInfo
- Publication number
- CN106768159A CN106768159A CN201710107472.0A CN201710107472A CN106768159A CN 106768159 A CN106768159 A CN 106768159A CN 201710107472 A CN201710107472 A CN 201710107472A CN 106768159 A CN106768159 A CN 106768159A
- Authority
- CN
- China
- Prior art keywords
- thermocouple
- armoured thermocouple
- nuclear power
- power station
- reactor core
- 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.)
- Granted
Links
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims abstract description 22
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 4
- 230000004323 axial length Effects 0.000 claims abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 239000011257 shell material Substances 0.000 description 3
- 229910000943 NiAl Inorganic materials 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011553 magnetic fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
A kind of nuclear power station reactor core level sensor, it is characterised in that:Including pressure-bearing sleeve pipe, armouring heating cable, armoured thermocouple, nickel powder and Al2O3Powder, heated armoured thermocouple is propped up comprising armoured thermocouple, N (N >=2) heat cable with the armouring for including N (N >=2) section resistive heater in pressure-bearing sleeve pipe, armoured thermocouple is located at the bottom of pressure-bearing sleeve pipe, the nickel powder of padding and compacting in N sections of resistive heater axial length region, in addition axial region, the Al of padding and compacting2O3Armoured thermocouple at powder, armoured thermocouple and heating constitutes the thermocouple measurement pair of measurement liquid level.Its sensitivity that both increased level gauging, improves the antijamming capability of measurement again.
Description
Technical field
It is more particularly to a kind of to be used for nuclear power station reactor core the present invention relates to a kind of heating type liquid level sensor for thermocouple
The measurement of temperature and liquid level.
Background technology
At present, the high temperature in the pressure vessel of pressurized-water reactor nuclear power plant and thermal power plant, high-pressure boiler or this kind of height of liquid storage tank
The liquid level sensor that the occasion of reliability requirement is used, use mostly differential pressure type level gauge, float level meter, magnetic fluid level gauge with
And the liquid level gauge such as transparent glass tube (plate), some belong to measurement indirectly in these liquid level gauges, and some reliabilities are not high, and some are used
Life-span is shorter.And in the occasion of these high reliability requests the reliability of level gauging be directly connected to production equipment safety and
Personal safety, so in the urgent need to a kind of equipment that can directly monitor liquid level in pressure resistant vessel of high reliability.In addition, (1)
Some hot end heating-type thermocouple liquid level gauges are monitoring single-point liquid levels, for multiple spot level monitoring, need to arrange branched hot junction
Heating-type thermocouple liquid level gauge, haves the shortcomings that volume is big, chamber wall through hole is more;(2) existing section heating type heat
Galvanic couple liquid level sensor, though having the advantages that small volume and measuring point are more, has grading resistance silk and differential thermocouple in sleeve pipe
The accurate location location difficulty and the poor shortcoming of MgO heat transfer of measuring point.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of nuclear power station to overcome the above-mentioned not enough of prior art
Reactor core level sensor, can directly, accurately and quickly monitor the liquid level of container inner medium, be more suitable in nuclear field
Used with the occasion of high reliability request.
The present invention solve the technical scheme that is used of above-mentioned technical problem for:
A kind of nuclear power station reactor core level sensor, it is characterised in that:Including pressure-bearing sleeve pipe, armouring heating cable, armouring heat
Galvanic couple, nickel powder and Al2O3Powder, in pressure-bearing sleeve pipe comprising armoured thermocouple, N (N >=2) prop up heated armoured thermocouple and comprising
There is the armouring heating cable of N (N >=2) section resistive heater, armoured thermocouple is located at the bottom of pressure-bearing sleeve pipe, in N sections of adding thermal resistance
The nickel powder of padding and compacting, axial region in addition, the Al of padding and compacting in silk axial length region2O3Powder, armoured thermocouple
With the thermocouple measurement pair that the armoured thermocouple at heating constitutes measurement liquid level.
The armoured thermocouple measurement Core cooling agent outlet temperature of above-mentioned bottom, is also the reference point of level gauging.N branch adds
The armoured thermocouple of heat is the sensing element for measuring liquid level, their measuring point and the N sections of center of resistance wire in U-shaped armouring heating cable
In identical height, the heat on N sections of resistive heater covers tube wall and passes to by the nickel by powder in pressure-bearing sleeve pipe and pressure-bearing
Pressure-bearing covers pipe external environment medium, due to liquid phase and the notable difference of the heat transfer property of vapour/gas phase media, so heating in nickel powder section
The temperature that measures of armoured thermocouple the pressure-bearing set pipe external environment medium that reflects at the measuring point high and low be liquid phase or vapour/
Gas phase, may thereby determine that the position of liquid level.It is poor that the distance between N sections of resistive heater represents mutual liquid level, borrows
Help physical packaging position, by the reference point and the armoured thermocouple heat outputting potential difference value Δ low electricity of E of heating of level gauging
Flat quantity, you can know liquid level.
Preferably, the measuring point of the heated armoured thermocouple of above-mentioned N branch is contour with the center of N sections of resistive heater,
So measure more accurate.
Preferably, the upper end of above-mentioned pressure-bearing sleeve pipe also sets up another armoured thermocouple, also serves as the reference point of level gauging,
With the thermocouple measurement pair that the armoured thermocouple at heating constitutes measurement liquid level.
Preferably, thermal resistance thermometer is also equipped with the cold end package tube of above-mentioned pressure-bearing sleeve pipe, by thermal resistance thermometer
There is provided armoured thermocouple cold junction compensation temperature, so as in the case where compensating wire is not used, pressure-bearing sleeve bottom is not heated
Armoured thermocouple can measure the temperature of medium.In addition, the operating mode for measured medium temperature higher than environment temperature, if pressure-bearing
Sleeve pipe is leaked, and the temperature for measuring can be raised, so as to judge whether pressure-bearing sleeve pipe leaks.
Preferably, above-mentioned resistance and temperature is calculated as Pt100, and such temperature measurement accuracy is higher.
Preferably, above-mentioned armoured thermocouple is corresponded with the armoured thermocouple of heating, constitutes the thermocouple of measurement liquid level
Measurement is right, and the liquid level of so measurement is more accurate.
Because the present invention is spaced filling using the mode of axial segmentation heating with thermal conductivity metal nickel powder and Al2O3 powder
Structure, can effectively increase the inhomogeneities along pressure-bearing sleeve surface Axial Temperature Distribution, i.e., along pressure-bearing sleeve surface, axle
A N number of low area high is formed to temperature, the sensitivity of level gauging is increased, meanwhile, the temperature of resistance wire is also reduced, thus
Improve the reliability of level gauging.Metal nickel powder is again conducting medium simultaneously, makes pressure-bearing sleeve pipe, armoured thermocouple and armouring
Heating cable mutual conduction is an equipotential body, improves the antijamming capability of measurement.
Present invention may also apply to the measurement of medium temperature and liquid level in other container or liquid storage tank.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
As shown in figure 1, a kind of nuclear power station reactor core level sensor, in pressure-bearing sleeve pipe 1 (its material is 316L)
Comprising:K-type (NiCr-NiAl) armoured thermocouple 2 and 7 (its shell material is 316L), 3 K-type (NiCr- for heating
NiAl) armoured thermocouple 6 (its shell material be 316L, external diameter be 1.0mm) and one include 3 sections of resistive heater (materials
Be Ni80Cr20) U-shaped armouring heating cable 5 (its shell material be 316L);3 sections of resistive heater axles in pressure-bearing sleeve pipe
To tightly packed thermal conductivity nickel powder 3 is filled with extension position, in addition, tightly packed Al is filled with2O3Powder 4.Pressure-bearing
Pt100 thermal resistance thermometers 8 are installed in the cold end package tube 9 of sleeve pipe.
3 measurement ends of the armoured thermocouple 6 of heating are located on 3 sections of center height of the armouring heating resistance wire of cable 5.
K-type armoured thermocouple 2 is located at the bottom of pressure-bearing sleeve pipe, and K-type armoured thermocouple 7 is located at the upper end of pressure-bearing sleeve pipe.
Claims (7)
1. a kind of nuclear power station reactor core level sensor, it is characterised in that:Including pressure-bearing sleeve pipe, armouring heating cable, armour
Dress thermocouple, nickel powder and Al2O3Powder, in pressure-bearing sleeve pipe comprising armoured thermocouple, N (N >=2) prop up heated armoured thermocouple and
Include the armouring heating cable of N (N >=2) section resistive heater, armoured thermocouple is located at the bottom of pressure-bearing sleeve pipe, in N sections of heating
The nickel powder of padding and compacting, axial region in addition, the Al of padding and compacting in resistance wire axial length region2O3Powder, armouring heat
Armoured thermocouple at galvanic couple and heating constitutes the thermocouple measurement pair of measurement liquid level.
2. nuclear power station reactor core level sensor according to claim 1, it is characterised in that:The N branch is added
The measuring point of the armoured thermocouple of heat is contour with the center of N sections of resistive heater.
3. nuclear power station reactor core level sensor according to claim 1, it is characterised in that:The pressure-bearing set
The upper end of pipe also sets up another armoured thermocouple, with heating at armoured thermocouple constitute measurement liquid level thermocouple measurement pair.
4. nuclear power station reactor core level sensor according to claim 3, it is characterised in that:The pressure-bearing set
Thermal resistance thermometer is installed in the cold end package tube of pipe.
5. nuclear power station reactor core level sensor according to claim 4, it is characterised in that:The thermal resistance temperature
Degree is calculated as Pt100.
6. nuclear power station reactor core level sensor according to claim 1, it is characterised in that:The armouring heat
Galvanic couple is corresponded with the armoured thermocouple of heating, constitutes the thermocouple measurement pair of measurement liquid level.
7. nuclear power station reactor core level sensor according to claim 1, it is characterised in that:The armouring heating
Cable is U-shaped.
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 true CN106768159A (en) | 2017-05-31 |
| CN106768159B CN106768159B (en) | 2023-11-21 |
Family
ID=58960632
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 |
|---|---|
| CN (1) | CN106768159B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987119A (en) * | 2019-11-26 | 2020-04-10 | 武汉雷施尔光电信息工程有限公司 | Optical fiber liquid level meter for high-temperature and high-pressure environment and manufacturing method thereof |
| 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 |
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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 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110987119A (en) * | 2019-11-26 | 2020-04-10 | 武汉雷施尔光电信息工程有限公司 | Optical fiber liquid level meter for high-temperature and high-pressure environment and manufacturing method thereof |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106768159B (en) | 2023-11-21 |
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