WO2013111847A1 - 液面レベル検知装置及び方法 - Google Patents

液面レベル検知装置及び方法 Download PDF

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Publication number
WO2013111847A1
WO2013111847A1 PCT/JP2013/051560 JP2013051560W WO2013111847A1 WO 2013111847 A1 WO2013111847 A1 WO 2013111847A1 JP 2013051560 W JP2013051560 W JP 2013051560W WO 2013111847 A1 WO2013111847 A1 WO 2013111847A1
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WO
WIPO (PCT)
Prior art keywords
signal
liquid
liquid level
unit
probe
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.)
Ceased
Application number
PCT/JP2013/051560
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English (en)
French (fr)
Japanese (ja)
Inventor
堅太郎 西村
克基 長瀬
藤雄 白石
夕佳 高田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
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Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to US14/374,272 priority Critical patent/US9423286B2/en
Priority to EP13741506.3A priority patent/EP2808658A4/en
Publication of WO2013111847A1 publication Critical patent/WO2013111847A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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
    • G01F23/24—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 variations of resistance of resistors due to contact with conductor fluid
    • G01F23/241—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 variations of resistance of resistors due to contact with conductor fluid for discrete levels
    • 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
    • G01F23/24—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 variations of resistance of resistors due to contact with conductor fluid
    • G01F23/241—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 variations of resistance of resistors due to contact with conductor fluid for discrete levels
    • G01F23/243—Schematic arrangements of probes combined with measuring circuits
    • 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
    • G01F23/24—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 variations of resistance of resistors due to contact with conductor fluid
    • G01F23/246—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 variations of resistance of resistors due to contact with conductor fluid thermal devices
    • G01F23/247—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 variations of resistance of resistors due to contact with conductor fluid thermal devices for discrete levels
    • G01F23/248—Constructional details; Mounting of probes
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C17/00—Monitoring; Testing ; Maintaining
    • G21C17/02—Devices or arrangements for monitoring coolant or moderator
    • G21C17/035—Moderator- or coolant-level detecting devices
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
    • G21C19/02—Details of handling arrangements
    • G21C19/06—Magazines for holding fuel elements or control elements
    • G21C19/07—Storage racks; Storage pools
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the present invention relates to a technique for detecting a liquid level of a liquid held in a container.
  • the spent fuel storage pool is monitored and operated so as not to drop below a reference level, for example, a liquid level that is slightly more than twice the length of the spent fuel assembly, in order to ensure the shielding effect of radiation by water.
  • a reference level for example, a liquid level that is slightly more than twice the length of the spent fuel assembly.
  • the liquid level of a spent fuel storage pool in the past has been measured by installing a float type level switch at the upper end of the pool. Moreover, the temperature of pool water was measured with the thermometer installed separately from this float type level switch.
  • the spent fuel storage pool has a refueling crane at the top and moves the entire upper surface, so the installation space for the liquid level gauge and thermometer is very limited.
  • a through hole cannot be provided in the pool wall surface, and a general differential pressure method cannot be employed as a liquid level meter.
  • measures for preventing foreign matter from entering the pool must be taken into consideration.
  • the present invention has been made in consideration of such circumstances, and even when the liquid held in the container boils and the liquid level falls, the liquid level can be reliably detected only by analog processing. It aims at providing the technology to do.
  • a plurality of probes in which a temperature sensor and a heater arranged in the vicinity of the detection point are enclosed in the liquid holding container are arranged at regular intervals in the vertical direction of the liquid holding container, and based on the temperature signal from the probe
  • a liquid level detecting device for measuring a liquid level of a liquid holding container, wherein a probe selection unit for selecting a probe to be energized to a heater from the plurality of probes, and a temperature of the probe selected by the probe selection unit
  • a calculation unit that outputs a result, and a gas-liquid identification unit that identifies whether the detection point exists in a gas phase or a liquid phase based on an output result of the calculation process
  • the present invention provides a technique for reliably detecting the liquid level only by analog processing even when the liquid held in the container boils and the liquid level is lowered.
  • FIG. 1 The conceptual diagram which shows the spent fuel storage pool to which the liquid level detection apparatus which concerns on embodiment of this invention was applied
  • FIG. 1A shows a spent fuel pool 1 to which the liquid level detection device 20 according to each embodiment is applied.
  • a rack 2 that houses a plurality of spent fuel assemblies 3 is arranged.
  • the spent fuel pool 1 is provided with a circulation cooler (not shown) for cooling the pool water 4 that is heated by the decay heat of the spent fuel assembly 3.
  • the probe 10 k includes an enclosing tube 11 enclosing a temperature sensor 12 and a heater 14 disposed in the vicinity of the detection point 15.
  • the temperature sensor 12 includes a copper-constantan thermocouple wire 13 housed in a sheath tube whose tip is closed. And between this strand 13 and a sheath pipe
  • thermocouple element 13 In order to detect the level of the pool water 4 at a deep position of the liquid holding container 1, it is necessary to install the thermocouple element 13 in a long state. However, in this case, since a large load is applied to the strand 13 of the thermocouple, excellent mechanical characteristics are required for the strand 13 itself. Furthermore, since the noise of the detected thermoelectromotive force increases as the wire 13 of the thermocouple becomes longer, it is necessary to employ a thermocouple having a large thermoelectromotive force in order to increase the S / N ratio.
  • the copper-constantan thermocouple wire 13 is superior to a commonly used chromel alumel thermocouple in that it has a large thermoelectromotive force and is suitable for low temperature measurement, but is inferior in mechanical properties. Therefore, a sheath-type copper-constantan thermocouple is used as the temperature sensor 12 to ensure mechanical strength.
  • This sheath-type copper-constantan temperature sensor 12 is manufactured by simultaneously pulling both the strands of the copper-constantan thermocouple before the tensile processing in the sheath tube before the tensile processing. . Since it is housed in the sheath tube, it is possible to create a long temperature sensor 12 in which an excessive load is not applied to the strand 13 of the copper-constantan thermocouple.
  • the enclosing tube 11 accommodates the temperature sensor 12 and the heater 14 inside, is filled with magnesium oxide having a high thermal conductivity, and the outside contacts the pool water 4 (liquid phase) and the atmosphere (gas phase).
  • the temperature sensor 12 measures the temperature of the pool water 4 (liquid phase) and the atmosphere (gas phase) through the enclosed tube 11 and magnesium oxide, and the thermal energy from the heater 14 causes the magnesium oxide and the enclosed tube 11 to pass through. It passes through and is discharged into the pool water 4 (liquid phase) and the atmosphere (gas phase).
  • the start point and period t of the heat supply are controlled by the determination unit 30.
  • a signal processing unit 34 for outputting a processing signal V B (k) of A (k), a calculation unit 35 for calculating the temperature signal V A (k) and the processing signal V B (k) and outputting a result,
  • a gas-liquid identification unit 37 for identifying whether the detection point 15 exists in the gas phase or the liquid phase based on the output result of the arithmetic processing, and a display unit 38 indicating the identification result of the gas-liquid identification unit 37 Have.
  • the heat supply control unit 32 supplies a constant flow of thermal energy to the heater 14 of the selected probe 10 k for a period t, and starts processing of the signal processing unit 34 in synchronization with the start point of the heat supply. . That is, the heat supply control unit 32 outputs a voltage signal for turning on / off the heater to the heat supply unit 22 to define the heat supply period t, and also outputs a voltage signal of the same level to the signal processing unit 34. To do.
  • the input unit 33 branches the input temperature signal V A (k) into two as an analog amount, inputs one directly to the calculation unit 35, and inputs the other to the signal processing unit 34.
  • the signal processing unit (hold circuit) 34A receives the synchronization signal from the heat supply control unit 32, the signal processing unit (hold circuit) 34A outputs the processing signal V B (k) held in the temperature signal V A (k) at the time of the input.
  • the signal processing unit 34A outputs the input temperature signal V A (k) as it is when the synchronization signal from the heat supply control unit 32 is set to OFF.
  • the processing signal V B (k) in which the input voltage level of the temperature signal V A (k) input at that time is held is continuously output until the setting is switched to the OFF setting again.
  • Such a signal processing unit 34A includes, for example, a hold circuit that combines a switch contact and a capacitor.
  • the graph of FIG. 3 shows that when the detection point 15 of the probe 10 k is exposed to the gas phase, the temperature signal V A when the synchronization signal of the heat supply control unit 32 is switched from the OFF setting to the ON setting. It shows the time change of the processed signal V B.
  • the thermal energy supplied from the heater 14 does not diffuse into the gas phase having a low thermal diffusivity. Raise.
  • the temperature signal V A (k) of the temperature sensor 12 rises with a time constant on the order of several minutes, and greatly deviates from the processing signal V B held in the temperature signal V A at the time of ON switching.
  • the graph of FIG. 4 shows that when the detection point 15 of the probe 10 k is immersed in the liquid phase, the temperature signal V A when the synchronization signal of the heat supply control unit 32 is switched from the OFF setting to the ON setting. It shows the time change of the processed signal V B.
  • the thermal energy supplied from the heater 14 diffuses into the liquid phase having a large thermal diffusivity, so that the ambient temperature of the detection point 15 is not so much. Does not rise. For this reason, the temperature signal V A (k) of the temperature sensor 12 reaches an equilibrium state without greatly deviating from the processing signal V B held in the temperature signal V A at the time of ON switching.
  • the computing unit 35 subtracts the temperature signal V A (k) and the processed signal V B (k) from each other and outputs the result to the threshold comparing unit 36.
  • the threshold comparison unit 36 outputs to the gas-liquid identification unit 37 a determination signal as to whether or not the relationship between the output of the calculation unit 35 and the threshold ⁇ satisfies the following determination formula (1) during the heat supply period t. .
  • the threshold ⁇ is set to an optimum value experimentally. ⁇ ⁇ V A (k) ⁇ V B (k) (1)
  • the gas-liquid identification unit 37 identifies that the tip of the probe 10 k is exposed to the gas phase if the determination formula (1) is satisfied, and if the determination formula (1) is not satisfied, the tip of the probe 10 k is the liquid phase. Identify as immersed in.
  • the display unit 38 indicates to the operator the result of identifying whether the tip of the probe 10 k is in the liquid phase or the gas phase, and is realized by a function of turning on or off the lamp, for example.
  • the calculation unit 35 (FIG. 2) divides the temperature signal V A (k) and the processing signal V B (k) from each other and outputs the result to the threshold comparison unit 36.
  • the threshold comparison unit 36 outputs a determination signal as to whether the relationship between the output of the calculation unit 35 and the threshold ⁇ satisfies the following determination formula (2) during the heat supply period t to the gas-liquid identification unit 37 .
  • the threshold value ⁇ is experimentally set to an optimum value. ⁇ ⁇ V A (k) / V B (k) (2)
  • the gas-liquid identification unit 37 identifies that the tip of the probe 10 k is exposed to the gas phase if the determination formula (2) is satisfied, and if not satisfied, the tip of the probe 10 k is the liquid phase. Identify as immersed in.
  • the signal processing unit 34B (34) in the determination unit 30 is a first-order lag circuit that outputs a first-order lag response of a temperature signal. 5 that are the same as or correspond to those in FIG. 2 are denoted by the same reference numerals, and redundant description is omitted.
  • the signal processing unit 34B is configured by a first-order lag circuit
  • the processing signal V B (k) used for gas-liquid identification is not generated without the need for the synchronization signal from the heat supply control unit 32. It can output to the calculating part 35 synchronizing with supply.
  • such a first-order lag circuit can be realized only with a resistor and a capacitor, and the threshold comparison unit 36 does not need to recognize the start point of the heat supply period t, so it is not conscious of time. Determination based on the above-described determination formula (1) or (2) can be performed. For this reason, in 2nd Embodiment, the structure of the determination part 30 can be simplified.
  • the graph of FIG. 6 shows the temperature signal V when the heat supply control unit 32 switches from the OFF setting to the ON setting when the detection point 15 of the probe 10 k in the second embodiment is exposed to the gas phase. It shows the time variations of the a and processing signals V B.
  • the processing signal V B converges to the temperature signal V A (k).
  • the temperature signal V A (k) from the gas phase rises greatly and shifts to a transient state.
  • the processing signal V B (k) indicating the first-order lag response in this transient state also increases following the temperature signal V A (k), but the change speed cannot follow and the two are greatly deviated.
  • the graph of FIG. 7 shows the temperature signal when the heat supply control unit 32 is switched from the OFF setting to the ON setting when the detection point 15 of the probe 10 k in the second embodiment is immersed in the liquid phase. It shows the time variations of the V a and its processed signal V B.
  • the processing signal V B converges to the temperature signal V A (k).
  • the temperature signal V A (k) from the liquid phase rises and transitions to a transient state, but the rate of change is small.
  • the processing signal V B (k) indicating the first order lag response in this transient state increases following the temperature signal V A (k), and the difference between the two is small.
  • the time constant of the first-order delay is about 60 seconds.
  • a processing signal V B (k) (hold value or first-order lag response) of the temperature signal V A (k) is output in synchronization with this heat supply (S15), and the temperature signal is output until the heat supply period t elapses.
  • V A (k) and its processed signal V B (k) are processed and output (S16; No, Yes). If the output result of the arithmetic processing satisfies the above-described determination formula (1) or (2), the gas phase is determined (S17; Yes, S18), and if it is not satisfied, the liquid phase is determined (S17). No, S19).
  • the liquid level of the liquid holding container 1 is determined (S20; Yes, S21).
  • liquid level detection device since it can be configured only with an analog circuit, it has toughness against unforeseen circumstances in nuclear facilities.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
PCT/JP2013/051560 2012-01-26 2013-01-25 液面レベル検知装置及び方法 Ceased WO2013111847A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US14/374,272 US9423286B2 (en) 2012-01-26 2013-01-25 Liquid level sensing apparatus and method
EP13741506.3A EP2808658A4 (en) 2012-01-26 2013-01-25 DEVICE AND METHOD FOR LIQUID LEVEL DETECTION

Applications Claiming Priority (2)

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JP2012014554A JP5583153B2 (ja) 2012-01-26 2012-01-26 液面レベル検知装置及び方法
JP2012-014554 2012-01-26

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JP2014055945A (ja) * 2012-09-11 2014-03-27 Ge-Hitachi Nuclear Energy Americas Llc 外部電力を用いずに使用済み燃料プールの温度および液面を測定する方法およびシステム
JP2017090253A (ja) * 2015-11-10 2017-05-25 日立Ｇｅニュークリア・エナジー株式会社 水位計測システム

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US20150323938A1 (en) * 2014-05-09 2015-11-12 Honeywell International Inc. Temperature-based level detection and control method and apparatus
JP6401584B2 (ja) * 2014-11-25 2018-10-10 住友精密工業株式会社 液面検出装置および液面検出システム
KR102514568B1 (ko) * 2016-12-30 2023-03-27 뉴스케일 파워, 엘엘씨 핵 반응기 보호 시스템 및 방법
JP6752169B2 (ja) * 2017-03-14 2020-09-09 日立Ｇｅニュークリア・エナジー株式会社 熱電対式液位計測システム
RU175490U1 (ru) * 2017-05-15 2017-12-06 Общество с ограниченной ответственностью Научно-производственное объединение (ООО НПО "ИНКОР") Зонд контроля температуры и уровня жидкости
US10760937B2 (en) * 2017-09-08 2020-09-01 RV Whisper LLC System and method for measuring the level of fluid in a container
US12181323B2 (en) * 2021-03-05 2024-12-31 Horiba Stec, Co., Ltd. Material supply system, a storage medium storing a program for a material supply system and material supply method
CN113280887A (zh) * 2021-05-14 2021-08-20 山西天泽煤化工集团股份公司 一种特殊算法液位计

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EP2808658A4 (en) 2015-12-23
US9423286B2 (en) 2016-08-23

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