JP2005164462A - Device for measuring water level - Google Patents

Device for measuring water level Download PDF

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JP2005164462A
JP2005164462A JP2003405518A JP2003405518A JP2005164462A JP 2005164462 A JP2005164462 A JP 2005164462A JP 2003405518 A JP2003405518 A JP 2003405518A JP 2003405518 A JP2003405518 A JP 2003405518A JP 2005164462 A JP2005164462 A JP 2005164462A
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water level
pressure
coefficient
function
amplification
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Naomi Yoshinari
尚美 吉成
Teruo Kobayashi
照雄 小林
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Hitachi Ltd
株式会社日立製作所
Hitachi Naka Electronics Co Ltd
日立那珂エレクトロニクス株式会社
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems, wherein an amplification part function of a water level detection part fails frequently and has poor maintainability. <P>SOLUTION: The amplification part function 5 is separated from a water level detector 1 and is provided in a control device 2. A water-level sensor 3 has a differential pressure detection part and a pressure detection part, a detection signal therefrom is transmitted to the amplification part function 5, and the water level is corrected through a pressure correction processing 11. A coefficient conversion processing 10 in the amplification part function 5 switches a coefficient, to be multiplied, by an input signal online corresponding to the condition. Since the amplification part function 5 is incorporated in the control device 2 having proper installation environment, the probability of failures in the amplification part function becomes low, and maintainability is improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は水位計測装置に係り、特に原子力発電所等における水位計測装置に関する。   The present invention relates to a water level measuring device, and more particularly to a water level measuring device in a nuclear power plant or the like.
図2は、高圧タービン制御装置の概略構成図で、高圧給水加熱器の水位を検出して弁7を制御する。水位検出器1はセンサ3と増幅部機能5を有している。センサ3は、測定流体である高圧第1給水加熱器の水位情報である差圧と、加熱器内の圧力を検知する。増幅部機能5は入力信号処理、補正処理、係数処理(レンジ処理)等を実施し、電気信号として制御装置2に伝達する。制御装置3は演算処理4にて水位制御演算を実施し、水位に応じた弁開度を制御量として現場の弁7を制御する。   FIG. 2 is a schematic configuration diagram of the high-pressure turbine control device, which controls the valve 7 by detecting the water level of the high-pressure feed water heater. The water level detector 1 has a sensor 3 and an amplification unit function 5. The sensor 3 detects the differential pressure that is the water level information of the high-pressure first feed water heater that is the measurement fluid, and the pressure in the heater. The amplification unit function 5 performs input signal processing, correction processing, coefficient processing (range processing), and the like, and transmits them to the control device 2 as electric signals. The control device 3 performs a water level control calculation in the calculation process 4 and controls the valve 7 in the field using the valve opening corresponding to the water level as a controlled variable.
同様な水位検出装置として特許文献1の記載がある。ここでは、原子炉圧力容器の水位監視のため水位センサと温度センサを設け、検出したデータをモニタリングに送信し、温度補正して水位を検出している。   There exists description of patent document 1 as a similar water level detection apparatus. Here, a water level sensor and a temperature sensor are provided for monitoring the water level of the reactor pressure vessel, the detected data is transmitted to the monitoring, and the water level is detected by correcting the temperature.
特開平10−160887号公報Japanese Patent Laid-Open No. 10-160887
上記高圧給水加熱器の水位検出器は、増幅部機能が現場の環境影響(放射線等)によって故障しやすく、かつ現場環境によっては修理のできない場合がある。また、特許文献1に記載の水位検出装置は、給水加熱器水位のように検出部の圧力が変動する場合に正確な水位を検出できない。   In the water level detector of the high-pressure feed water heater, the function of the amplifying unit is likely to break down due to environmental influences (such as radiation) on the site, and repair may not be possible depending on the site environment. Moreover, the water level detection apparatus of patent document 1 cannot detect an exact water level, when the pressure of a detection part fluctuates like a feed water heater water level.
本発明の目的は、上記従来技術の問題点に鑑み、水位の検出精度が高く保守性にも適した水位検出装置を提供することにある。   An object of the present invention is to provide a water level detection device that has high water level detection accuracy and is suitable for maintainability in view of the above-described problems of the prior art.
上記目的を達成する発明は、水位に応じてプラントの制御量を決定するため、現場でプラントの水位を検出する水位計測装置において、現場における水位検出器と、その検出信号を現場から離れた場所で受信し所要の係数変換処理と補正処理を行う増幅部を設けることを特徴とする。   The invention that achieves the above object is a water level measurement device that detects the water level of a plant in the field in order to determine the control amount of the plant according to the water level. And an amplifying unit for performing necessary coefficient conversion processing and correction processing.
また、前記水位検出器は差圧検出部と圧力検出部からなり、前記増幅部の補正処理で前記差圧検出部による差圧信号を前記圧力検出部の圧力信号で補正して水位を求めることを特徴とする。   The water level detector includes a differential pressure detection unit and a pressure detection unit. In the correction process of the amplification unit, the differential pressure signal from the differential pressure detection unit is corrected with the pressure signal of the pressure detection unit to obtain the water level. It is characterized by.
また、前記増幅部の係数変換処理は前記検出信号から水位を演算するときの係数を条件に応じて選択することを特徴とする。   Further, the coefficient conversion processing of the amplifying unit is characterized in that a coefficient for calculating a water level from the detection signal is selected according to a condition.
本発明によれば、従来水位検出器内に存在していた増幅部機能を切離し、制御装置内の演算部に設けて処理するので故障しにくく、かつ保守も容易になる。また、水位計算のための係数を運転中においても変更可能となる。また、水位検出装置の水位精度が向上する。   According to the present invention, since the amplification unit function that has conventionally existed in the water level detector is separated and provided in the calculation unit in the control device, the failure is hardly caused and maintenance is facilitated. Also, the coefficient for water level calculation can be changed during operation. Further, the water level accuracy of the water level detection device is improved.
以下、本発明の一実施例を図面を参照して説明する。図1は水位を計測し、現場の弁を制御する水位計測制御装置の構成を示す。現場としては、たとえば図2に示したタービンプラントで、タービンと高圧給水加熱器と弁からなる制御系である。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration of a water level measurement control device that measures a water level and controls a valve on site. An example of the site is a control system including a turbine, a high-pressure feed water heater, and a valve in the turbine plant shown in FIG.
現場の高圧給水加熱器に設置される水位検出器1は、センサとして差圧検出部と圧力検出部を有している。制御装置2には、水位検出器から分離された増幅部機能5と制御演算のためのPI(比例積分)6をもつ演算処理部4を有している。増幅部機能5は水位検出器1からのデータを受けて、入力信号処理9、係数変換処理10、圧力補正処理11などを行う。   The water level detector 1 installed in the high-pressure feed water heater at the site has a differential pressure detector and a pressure detector as sensors. The control device 2 has an arithmetic processing unit 4 having an amplification unit function 5 separated from the water level detector and a PI (proportional integration) 6 for control calculation. The amplifying unit function 5 receives data from the water level detector 1 and performs input signal processing 9, coefficient conversion processing 10, pressure correction processing 11, and the like.
次に水位計測制御動作について説明する。まず、水位検出器1において水位のレベルをセンサ3により検出する。センサ3は差圧センサを有し、ここでは水位を差圧として検出する。また、センサ3は圧力センサを有し、水位検出部の圧力を検出する。これら差圧(水位)と圧力は電気信号8として制御装置2へ伝達される。給水加熱器内の圧力は変動するので、差圧センサはこの圧力に応じた特性を係数情報にメモリ、この係数情報に基づいて差圧センサの信号を補正処理し、水位信号として出力する。   Next, the water level measurement control operation will be described. First, the water level is detected by the sensor 3 in the water level detector 1. The sensor 3 has a differential pressure sensor, and detects the water level as a differential pressure here. Moreover, the sensor 3 has a pressure sensor, and detects the pressure of a water level detection part. These differential pressure (water level) and pressure are transmitted to the control device 2 as an electric signal 8. Since the pressure in the feed water heater fluctuates, the differential pressure sensor stores a characteristic corresponding to the pressure in coefficient information, corrects the differential pressure sensor signal based on the coefficient information, and outputs it as a water level signal.
制御装置2は受信した情報を元に、演算処理4で入力信号処理、係数変換処理、補正処理を実施し、実水位信号を算出する。この結果、算出された実水位にPI(比例積分)処理を行い、弁の開度指令として弁7に出力することで、水位計測制御が実施される。   Based on the received information, the control device 2 performs an input signal process, a coefficient conversion process, and a correction process in the calculation process 4 to calculate an actual water level signal. As a result, a PI (proportional integration) process is performed on the calculated actual water level, and is output to the valve 7 as a valve opening degree command, whereby the water level measurement control is performed.
図3に増幅部機能を示す。水位検出器1より検出された差圧検出信号、圧力検出信号にそれぞれ入力信号処理と係数変換処理を行う。この結果の水位信号を圧力信号によって補正処理し、実水位信号として出力する。   FIG. 3 shows the amplification unit function. Input signal processing and coefficient conversion processing are performed on the differential pressure detection signal and the pressure detection signal detected by the water level detector 1, respectively. The resulting water level signal is corrected by the pressure signal and output as an actual water level signal.
次に、係数変換処理について詳細に説明する。図4は増幅部機能の係数情報設定についての構成を示す。保守ツール12は中央制御室に設置され、増幅部機能5内の係数情報を演算処理部4のメモリに設定する。   Next, the coefficient conversion process will be described in detail. FIG. 4 shows a configuration for setting coefficient information of the amplification unit function. The maintenance tool 12 is installed in the central control room, and sets coefficient information in the amplification unit function 5 in the memory of the arithmetic processing unit 4.
図5に係数情報の一例を示す。係数情報は水位や圧力などの信号毎に、スパン調整や密度調整などの係数を有し、測定流体に応じて設定1あるいは設定2などの係数を切り替え(選択)、設定される。保守ツール12はこれらの設定値を、増幅部機能5が参照するメモリに予め設定する。係数変換処理10は設定値をオンラインで選択して入力信号に対する演算を可能にする。たとえば、実水位と演算内部での指示値が違った場合に係数を変更することで正規の指示に調整することが可能になる。   FIG. 5 shows an example of coefficient information. The coefficient information has coefficients such as span adjustment and density adjustment for each signal such as water level and pressure, and the coefficient such as setting 1 or setting 2 is switched (selected) and set according to the measured fluid. The maintenance tool 12 presets these set values in a memory referred to by the amplification unit function 5. The coefficient conversion process 10 selects a set value online and enables calculation on an input signal. For example, when the actual water level is different from the indicated value in the calculation, it is possible to adjust to the normal indication by changing the coefficient.
図6に係数情報設定フローを示す。係数変換処理10は対象測定流体の情報を入力し(s101)、水位、流量、圧力の場合分けを行う(s102)。水位の場合は、メモリに設定されている係数情報(水位)から所定の係数情報を入力し、入力情報に合致すれば(s104)終了する。   FIG. 6 shows a coefficient information setting flow. The coefficient conversion process 10 inputs information on the target measurement fluid (s101), and classifies the water level, flow rate, and pressure (s102). In the case of the water level, predetermined coefficient information is input from the coefficient information (water level) set in the memory, and if it matches the input information (s104), the process ends.
本実施例によれば、増幅部機能5を制御装置内に持たせることにより、現場環境(放射線等)の影響が少なく故障が低減できる。また、差圧で検出する水位を該当部の圧力を検出して補正することで、検出精度を向上できる。さらに、増幅部機能の定数設定を運転中に容易に変更できるので、条件に応じた定数をオンラインで取得できる。   According to the present embodiment, by providing the amplifying unit function 5 in the control device, the influence of the on-site environment (radiation and the like) is small and failure can be reduced. In addition, the detection accuracy can be improved by correcting the water level detected by the differential pressure by detecting the pressure of the corresponding part. Furthermore, since the constant setting of the amplification unit function can be easily changed during operation, the constant according to the condition can be acquired online.
本発明の一実施例による水位計測制御装置の構成図。The block diagram of the water level measurement control apparatus by one Example of this invention. 本発明を適用するタービン制御系における水位計測制御装置の構成図。The block diagram of the water level measurement control apparatus in the turbine control system to which this invention is applied. 増幅部機能を示すフロー図。The flowchart which shows an amplifier part function. 増幅部機能における係数情報設定の機能を示す水位計測制御装置の構成図。The block diagram of the water level measurement control apparatus which shows the function of the coefficient information setting in an amplification part function. 係数情報の一例を示すデータ構成図。The data block diagram which shows an example of coefficient information. 係数情報の設定フロー図。Coefficient information setting flow diagram.
符号の説明Explanation of symbols
1…水位検出器、2…制御装置、3…センサ、4…演算処理部、5…増幅部機能、6…PI機能、7…弁、9…入力信号処理、10…係数変換処理、11…圧力補正処理、12…保守ツール。   DESCRIPTION OF SYMBOLS 1 ... Water level detector, 2 ... Control apparatus, 3 ... Sensor, 4 ... Operation processing part, 5 ... Amplification part function, 6 ... PI function, 7 ... Valve, 9 ... Input signal processing, 10 ... Coefficient conversion process, 11 ... Pressure correction processing, 12 ... maintenance tool.

Claims (4)

  1. 水位に応じてプラントの制御量を決定するため、現場でプラントの水位を検出する水位計測装置において、
    現場における水位検出器と、その検出信号を現場から離れた場所で受信し所要の係数変換処理と補正処理を行う増幅部を設けることを特徴とする水位計測装置。
    In order to determine the control amount of the plant according to the water level, in the water level measuring device that detects the water level of the plant on site,
    A water level measuring apparatus comprising: a water level detector at a site; and an amplification unit that receives the detection signal at a location away from the site and performs a required coefficient conversion process and correction process.
  2. 請求項1において、前記水位検出器は差圧検出部と圧力検出部からなり、前記増幅部の補正処理で前記差圧検出部による差圧信号を前記圧力検出部の圧力信号で補正して水位を求めることを特徴とする水位計測装置。   2. The water level detector according to claim 1, wherein the water level detector includes a differential pressure detection unit and a pressure detection unit, and a correction signal of the differential pressure detection unit is corrected by a pressure signal of the pressure detection unit in a correction process of the amplification unit. A water level measuring device characterized by obtaining
  3. 請求項1または2において、前記増幅部の係数変換処理は前記検出信号から水位を演算するときの係数を条件に応じて選択することを特徴とする水位計測装置。   3. The water level measuring device according to claim 1, wherein the coefficient conversion process of the amplifying unit selects a coefficient for calculating a water level from the detection signal according to a condition.
  4. タービンと給水加熱器と弁からなるタービン制御系にあって、給水過熱器の水位を検出して弁を制御するための水位計測装置において、
    水位を検出するための差圧検出器と前記給水過熱器内の圧力を検出する圧力検出器を前記給水加熱器に設け、差圧信号と圧力信号から水位を補正して求める補正処理と、水位を演算するための係数を条件に応じて設定する係数変換処理を行う増幅部を、前記給水過熱器から離れた場所に置かれた制御装置に設けたことを特徴とする水位計測装置。
    In a turbine control system comprising a turbine, a feed water heater and a valve, in a water level measuring device for detecting the water level of the feed water superheater and controlling the valve,
    A correction process for obtaining a differential pressure detector for detecting a water level and a pressure detector for detecting a pressure in the feed water superheater in the feed water heater, and correcting the water level from the differential pressure signal and the pressure signal; A water level measuring device, wherein an amplifying unit for performing a coefficient conversion process for setting a coefficient for calculating the coefficient according to a condition is provided in a control device placed at a location away from the feed water superheater.
JP2003405518A 2003-12-04 2003-12-04 Device for measuring water level Pending JP2005164462A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103103931A (en) * 2013-01-21 2013-05-15 陕西科技大学 Water level detection alarm device at low-lying positions of bridge and culvert

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103103931A (en) * 2013-01-21 2013-05-15 陕西科技大学 Water level detection alarm device at low-lying positions of bridge and culvert

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