JP6071870B2 - Hydrogen oxygen concentration measuring device, hydrogen oxygen concentration measuring system, and hydrogen oxygen concentration measuring method - Google Patents

Hydrogen oxygen concentration measuring device, hydrogen oxygen concentration measuring system, and hydrogen oxygen concentration measuring method Download PDF

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JP6071870B2
JP6071870B2 JP2013272462A JP2013272462A JP6071870B2 JP 6071870 B2 JP6071870 B2 JP 6071870B2 JP 2013272462 A JP2013272462 A JP 2013272462A JP 2013272462 A JP2013272462 A JP 2013272462A JP 6071870 B2 JP6071870 B2 JP 6071870B2
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沙矢香 松田
沙矢香 松田
弘章 見城
弘章 見城
伊藤 敏明
敏明 伊藤
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本発明は、水素酸素濃度計測装置、水素酸素濃度計測システム、および水素酸素濃度計測方法に関する。   The present invention relates to a hydrogen oxygen concentration measuring device, a hydrogen oxygen concentration measuring system, and a hydrogen oxygen concentration measuring method.

酸素濃度計測システムは、雰囲気中の酸素濃度を計測するシステムであり、例えば、事故を未然に防止する等の観点から原子炉格納容器内の酸素濃度を計測する際に用いられている。一般に原子炉格納容器内の酸素濃度計測システムでは、まず、サンプリング装置により原子炉格納容器内の雰囲気(ガス)を原子炉格納容器外へ引き出しサンプリングする。そして、原子炉格納容器外へ引き出されたサンプリングガスの除湿を行ったうえで、酸素ガス分析計を用いて酸素濃度を計測している(特許文献1参照)。   The oxygen concentration measurement system is a system that measures the oxygen concentration in the atmosphere, and is used, for example, when measuring the oxygen concentration in the reactor containment vessel from the viewpoint of preventing accidents. In general, in a system for measuring oxygen concentration in a reactor containment vessel, first, an atmosphere (gas) in the reactor containment vessel is drawn out of the reactor containment vessel and sampled by a sampling device. Then, after dehumidifying the sampling gas drawn out of the reactor containment vessel, the oxygen concentration is measured using an oxygen gas analyzer (see Patent Document 1).

特許第3699804号公報Japanese Patent No. 3699804

上述した酸素濃度計測システムは、原子炉格納容器内のガスを原子炉格納容器外へ引き出してサンプリングするサンプリング装置と、サンプリング装置がサンプリングしたサンプリングガスを除湿するための除湿器とを備えているため、サンプリング装置および除湿器に何らかのトラブルが生じるとサンプリングガスの酸素濃度計測が困難になることが課題である。   The oxygen concentration measurement system described above includes a sampling device that draws and samples the gas in the containment vessel outside the containment vessel, and a dehumidifier for dehumidifying the sampling gas sampled by the sampling device. The problem is that if any trouble occurs in the sampling device and the dehumidifier, it becomes difficult to measure the oxygen concentration of the sampling gas.

より具体的には、サンプリング配管の破損やサンプリング用ポンプの交流電源喪失が起こった場合、サンプリング装置によるサンプリングガスのサンプリングが困難となり、サンプリングガスの酸素濃度計測が困難な状態に陥ってしまう。また、酸素濃度計測システムに備えられる除湿器は、ガスを除湿する際に冷却水を必要とするため、冷却水源を喪失した場合にも、サンプリングガスの除湿ができず、サンプリングガスの酸素濃度計測が困難な状態に陥ってしまう。   More specifically, when the sampling pipe is damaged or the AC power source of the sampling pump is lost, it is difficult to sample the sampling gas by the sampling device, and it becomes difficult to measure the oxygen concentration of the sampling gas. In addition, since the dehumidifier equipped in the oxygen concentration measurement system requires cooling water when dehumidifying the gas, the sampling gas cannot be dehumidified even if the cooling water source is lost, and the oxygen concentration measurement of the sampling gas is performed. Falls into a difficult state.

一方、サンプリングガスのサンプリングが不要な酸素濃度計としてジルコニア式酸素計が知られているが、ジルコニア式酸素計を用いたとしても特許文献1に記載される酸素濃度計測システムのように、サンプリングガス中に水素などの可燃性ガスが含まれている環境下で適用する場合、酸素濃度測定の測定誤差を生じる可能性が高く精度の良い測定が困難になるという課題がある。   On the other hand, a zirconia oxygen meter is known as an oxygen concentration meter that does not require sampling of the sampling gas. However, even if a zirconia oxygen meter is used, a sampling gas is used as in the oxygen concentration measurement system described in Patent Document 1. When applied in an environment containing a flammable gas such as hydrogen, there is a problem that a measurement error in oxygen concentration measurement is likely to occur and accurate measurement becomes difficult.

また、サンプリングガス中に水素などの可燃性ガスが含まれている環境下では酸素のみならず水素などの可燃性ガスの濃度についても計測したい場合もある。酸素および水素などの可燃性ガスの両方の濃度を計測したい場合、従来は、異なる2個の計測ユニット、すなわち、酸素濃度を計測するユニットと水素などの可燃性ガスの濃度を計測する計測ユニットとを用いて濃度の計測を行っている。そのため、より簡単な構成(可能ならば同じユニット)で酸素および水素などの可燃性ガスの両方の濃度を計測可能な装置が望まれている。   Further, in an environment where a flammable gas such as hydrogen is contained in the sampling gas, there are cases where it is desired to measure not only oxygen but also the concentration of flammable gas such as hydrogen. If you want to measure the concentration of both flammable gases such as oxygen and hydrogen, conventionally there are two different measurement units: a unit that measures oxygen concentration and a measurement unit that measures the concentration of flammable gas such as hydrogen. Is used to measure the concentration. Therefore, an apparatus that can measure the concentrations of both combustible gases such as oxygen and hydrogen with a simpler configuration (the same unit if possible) is desired.

本発明は、上述した課題を解決するためになされたものであり、酸素濃度が計測される被計測ガスのサンプリングなどを不要にし、被計測ガス中に水素などの可燃性ガスが含まれる場合にも高精度で酸素濃度の計測が可能な水素酸素濃度計測装置、水素酸素濃度計測システム、および水素酸素濃度計測方法を得ることを目的とする。   The present invention has been made in order to solve the above-described problems, and eliminates the need for sampling of a measurement target gas in which the oxygen concentration is measured, and the measurement target gas includes a combustible gas such as hydrogen. Another object of the present invention is to obtain a hydrogen oxygen concentration measuring device, a hydrogen oxygen concentration measuring system, and a hydrogen oxygen concentration measuring method capable of measuring oxygen concentration with high accuracy.

本発明の実施形態に係る水素酸素濃度計測装置は、上述した課題を解決するため、第1の電極が配設され、比較ガスが導入される比較ガス導入部と、第2の電極と第3の電極とが配設され、水素濃度および酸素濃度が計測される被計測ガスが導入される被計測ガス導入部と、前記第1の電極および前記第2の電極との間に接触した状態で介在する酸素イオン伝導部とを備え、前記第2の電極および前記第3の電極を用いて第1の電気的物理量を検出することによって、前記被計測ガスに含まれる水素を検出し、前記第1の電極および前記第2の電極を用いて第2の電気的物理量を検出することによって、前記被計測ガスに含まれる酸素を検出する水素酸素検出手段と、予め与えられる前記第1の電気的物理量と水素濃度との関係を示すデータである水素濃度計測用データを参照し、前記水素酸素検出手段から得られる前記第1の電気的物理量の値と対応する前記水素濃度の値を前記被計測ガスの水素濃度の計測値として得る水素濃度計測手段と、予め与えられる前記被計測ガスの異なる複数の水素濃度毎の前記第2の電気的物理量と前記被計測ガスの酸素濃度との関係を示すデータを有する酸素濃度計測用データを参照し、前記水素濃度計測手段が得る前記被計測ガスの水素濃度の前記酸素濃度計測用データにおける前記水素酸素検出手段から取得する前記第2の電気的物理量の値と対応する前記被計測ガスの酸素濃度の値を前記被計測ガスの酸素濃度の計測値として得る酸素濃度計測手段と、を具備することを特徴とする。 In order to solve the above-described problem, the hydrogen oxygen concentration measuring apparatus according to the embodiment of the present invention is provided with the first electrode, the comparison gas introduction unit into which the comparison gas is introduced, the second electrode, and the third electrode. The electrode to be measured is in contact with the measurement gas introduction part into which the measurement gas for measuring the hydrogen concentration and the oxygen concentration is introduced, and the first electrode and the second electrode. An oxygen ion conducting part interposed, and detecting hydrogen contained in the measurement gas by detecting a first electrical physical quantity using the second electrode and the third electrode; Hydrogen oxygen detection means for detecting oxygen contained in the gas to be measured by detecting a second electrical physical quantity using the first electrode and the second electrode, and the first electrical electrode provided in advance Data showing the relationship between physical quantity and hydrogen concentration Hydrogen concentration with reference to certain hydrogen concentration measurement data, and obtaining the hydrogen concentration value corresponding to the first electrical physical quantity value obtained from the hydrogen oxygen detecting means as a measured value of the hydrogen concentration of the gas to be measured Reference is made to data for measuring oxygen concentration, which includes data indicating the relationship between the measurement means and the second electrical physical quantity for each of a plurality of different hydrogen concentrations of the gas to be measured and the oxygen concentration of the gas to be measured. The oxygen concentration of the measurement gas corresponding to the value of the second electrical physical quantity acquired from the hydrogen oxygen detection means in the oxygen concentration measurement data of the hydrogen concentration of the measurement gas obtained by the hydrogen concentration measurement means And an oxygen concentration measuring means for obtaining the above value as a measured value of the oxygen concentration of the measurement target gas.

本発明の実施形態に係る水素酸素濃度計測システムは、上述した課題を解決するため、前記水素酸素濃度計測装置を備えるシステムであって、前記被計測ガスが封入される容器内の圧力を計測する圧力計から出力される圧力情報が示す前記容器内の圧力に基づいて、前記水素濃度計測手段が計測した前記被計測ガス中の水素濃度および前記酸素濃度計測手段が計測した前記被計測ガス中の酸素濃度の少なくとも一方を、前記容器内の全圧に対する濃度に換算する換算手段を具備することを特徴とする。   In order to solve the above-described problem, a hydrogen oxygen concentration measurement system according to an embodiment of the present invention is a system including the hydrogen oxygen concentration measurement device, and measures a pressure in a container in which the gas to be measured is sealed. Based on the pressure in the container indicated by the pressure information output from the pressure gauge, the hydrogen concentration in the measurement gas measured by the hydrogen concentration measurement unit and the measurement target gas measured by the oxygen concentration measurement unit Conversion means for converting at least one of the oxygen concentrations into a concentration with respect to the total pressure in the container is provided.

本発明の実施形態に係る水素酸素濃度計測方法は、上述した課題を解決するため、第1の電極が配設され、比較ガスが導入される比較ガス導入部と、第2の電極と第3の電極とが配設され、水素濃度および酸素濃度が計測される被計測ガスが導入される被計測ガス導入部と、前記第1の電極および前記第2の電極との間に接触した状態で介在する酸素イオン伝導部とを備え、前記第2の電極および前記第3の電極を用いて第1の電気的物理量を検出することによって、前記被計測ガスに含まれる水素を検出し、前記第1の電極および前記第2の電極を用いて第2の電気的物理量を検出することによって、前記被計測ガスに含まれる酸素を検出する水素酸素検出手段と、予め与えられる前記第1の電気的物理量と水素濃度との関係を示すデータである水素濃度計測用データを参照し、前記水素酸素検出手段から得られる前記第1の電気的物理量の値と対応する前記水素濃度の値を前記被計測ガスの水素濃度の計測値として得る水素濃度計測手段と、予め与えられる前記被計測ガスの異なる複数の水素濃度毎の前記第2の電気的物理量と前記被計測ガスの酸素濃度との関係を示すデータを有する酸素濃度計測用データを参照し、前記水素濃度計測手段が得る前記被計測ガスの水素濃度の前記酸素濃度計測用データにおける前記水素酸素検出手段から取得する前記第2の電気的物理量の値と対応する前記被計測ガスの酸素濃度の値を前記被計測ガスの酸素濃度の計測値として得る酸素濃度計測手段とを具備する装置を用いて行う水素酸素濃度計測方法であり、前記水素酸素検出手段が、前記比較ガスが前記比較ガス導入部に導入されるとともに前記被計測ガスが前記被計測ガス導入部に導入される場合に前記第1の電気的物理量と前記第2の電気的物理量とを検出するステップと、前記水素濃度計測手段が、前記水素濃度計測用データを参照し、前記水素酸素検出手段から得られる前記第1の電気的物理量の値と対応する前記水素濃度の値を前記被計測ガスの水素濃度の計測値として得るステップと、前記酸素濃度計測手段が、前記酸素濃度計測用データを参照し、前記水素濃度計測手段が得る前記被計測ガスの水素濃度の前記酸素濃度計測用データにおける前記水素酸素検出手段から取得する前記第2の電気的物理量の値と対応する前記被計測ガスの酸素濃度の値を前記被計測ガスの酸素濃度の計測値として得るステップと、を備えることを特徴とする。 In order to solve the above-described problem, the hydrogen oxygen concentration measurement method according to the embodiment of the present invention is provided with a first electrode, a reference gas introduction unit into which a reference gas is introduced, a second electrode, and a third electrode. The electrode to be measured is in contact with the measurement gas introduction part into which the measurement gas for measuring the hydrogen concentration and the oxygen concentration is introduced, and the first electrode and the second electrode. An oxygen ion conducting part interposed, and detecting hydrogen contained in the measurement gas by detecting a first electrical physical quantity using the second electrode and the third electrode; Hydrogen oxygen detection means for detecting oxygen contained in the gas to be measured by detecting a second electrical physical quantity using the first electrode and the second electrode, and the first electrical electrode provided in advance Data showing the relationship between physical quantity and hydrogen concentration Hydrogen concentration with reference to certain hydrogen concentration measurement data, and obtaining the hydrogen concentration value corresponding to the first electrical physical quantity value obtained from the hydrogen oxygen detecting means as a measured value of the hydrogen concentration of the gas to be measured Reference is made to data for measuring oxygen concentration, which includes data indicating the relationship between the measurement means and the second electrical physical quantity for each of a plurality of different hydrogen concentrations of the gas to be measured and the oxygen concentration of the gas to be measured. The oxygen concentration of the measurement gas corresponding to the value of the second electrical physical quantity acquired from the hydrogen oxygen detection means in the oxygen concentration measurement data of the hydrogen concentration of the measurement gas obtained by the hydrogen concentration measurement means Is a hydrogen oxygen concentration measuring method performed using an apparatus comprising an oxygen concentration measuring means for obtaining an oxygen concentration measurement value of the gas to be measured. A step of detecting the first electrical physical quantity and the second electrical physical quantity when the reference gas is introduced into the comparison gas introduction section and the measurement gas is introduced into the measurement gas introduction section; The hydrogen concentration measuring means refers to the hydrogen concentration measurement data, and determines the value of the hydrogen concentration corresponding to the value of the first electrical physical quantity obtained from the hydrogen oxygen detecting means of the gas to be measured. The step of obtaining a measurement value of hydrogen concentration, the oxygen concentration measurement means refers to the oxygen concentration measurement data, and the hydrogen concentration of the measurement gas obtained by the hydrogen concentration measurement means in the oxygen concentration measurement data Obtaining a value of the oxygen concentration of the measurement gas corresponding to the value of the second electrical physical quantity acquired from the hydrogen oxygen detection means as a measurement value of the oxygen concentration of the measurement gas; It is characterized by providing.

本発明によれば、酸素濃度が計測される被計測ガスのサンプリングなどを不要にし、被計測ガス中に水素などの可燃性ガスが含まれる場合にも高精度で酸素濃度を計測することができる。   According to the present invention, it is not necessary to sample the gas to be measured for measuring the oxygen concentration, and the oxygen concentration can be measured with high accuracy even when the gas to be measured contains a combustible gas such as hydrogen. .

本発明の実施形態に係る水素酸素濃度計測装置の機能ブロック図。The functional block diagram of the hydrogen oxygen concentration measuring device which concerns on embodiment of this invention. 本発明の実施形態に係る水素酸素濃度計測装置の水素濃度計測用データの一例を示す説明図。Explanatory drawing which shows an example of the hydrogen concentration measurement data of the hydrogen oxygen concentration measuring device which concerns on embodiment of this invention. 本発明の実施形態に係る水素酸素濃度計測装置の酸素濃度計測用データの一例を示す説明図。Explanatory drawing which shows an example of the oxygen concentration measurement data of the hydrogen oxygen concentration measuring device which concerns on embodiment of this invention. 本発明の実施形態に係る水素酸素濃度計測装置における水素酸素検出手段(水素酸素検出ユニット)の構成を示す概略図。Schematic which shows the structure of the hydrogen oxygen detection means (hydrogen oxygen detection unit) in the hydrogen oxygen concentration measuring device which concerns on embodiment of this invention. 本発明の実施形態に係る水素酸素濃度計測システムの構成を示す概略図。Schematic which shows the structure of the hydrogen oxygen concentration measuring system which concerns on embodiment of this invention.

以下、本発明の実施形態に係る水素酸素濃度計測装置、水素酸素濃度計測システム、および水素酸素濃度計測方法について、図面を参照して説明する。   Hereinafter, a hydrogen oxygen concentration measuring device, a hydrogen oxygen concentration measuring system, and a hydrogen oxygen concentration measuring method according to embodiments of the present invention will be described with reference to the drawings.

図1は、本発明の実施形態に係る水素酸素濃度計測装置の一例である水素酸素濃度計測装置10の機能ブロック図である。   FIG. 1 is a functional block diagram of a hydrogen oxygen concentration measuring apparatus 10 which is an example of a hydrogen oxygen concentration measuring apparatus according to an embodiment of the present invention.

水素酸素濃度計測装置10は、雰囲気中のガス(被計測ガス)1に含まれる水素濃度および酸素濃度をまとめて計測する装置であり、例えば、被計測ガス1に含まれる水素および酸素を検出する水素酸素検出手段としての水素酸素検出ユニット11と、水素酸素検出ユニット11が検出した被計測ガス1に含まれる水素に起因して生じる電流等の電気的物理量と水素濃度計測用データ12とに基づいて被計測ガス1の水素濃度を計測する水素濃度計測手段13と、水素酸素検出ユニット11が検出した被計測ガス1に含まれる酸素に起因して生じる電圧等の電気的物理量と酸素濃度計測用データ14とに基づいて被計測ガス1の酸素濃度を計測する酸素濃度計測手段15と、を具備する。   The hydrogen oxygen concentration measuring device 10 is a device that collectively measures the hydrogen concentration and the oxygen concentration contained in the gas (measured gas) 1 in the atmosphere. For example, it detects hydrogen and oxygen contained in the measured gas 1. Based on a hydrogen oxygen detection unit 11 as a hydrogen oxygen detection means, an electrical physical quantity such as a current generated due to hydrogen contained in the measurement target gas 1 detected by the hydrogen oxygen detection unit 11, and hydrogen concentration measurement data 12. A hydrogen concentration measuring means 13 for measuring the hydrogen concentration of the gas 1 to be measured, and an electrical physical quantity such as a voltage caused by oxygen contained in the gas 1 to be measured detected by the hydrogen oxygen detection unit 11 and an oxygen concentration measurement And oxygen concentration measuring means 15 for measuring the oxygen concentration of the gas 1 to be measured based on the data 14.

水素酸素検出ユニット11は、水素酸素検出手段の水素検出機能と酸素検出機能とを提供する水素酸素検出部11aと、水素酸素検出部11aが被計測ガス1に含まれる水素を検出した結果を示す水素検出信号の信号レベルを計測する水素検出信号計測部11bと、水素酸素検出部11aが被計測ガス1に含まれる酸素の検出結果となる酸素検出信号の信号レベルを計測する酸素検出信号計測部11cとを備える。水素検出信号計測部11bの出力は、被計測ガス1に含まれる水素の濃度を計測する基礎情報として水素濃度計測手段13に入力される。酸素検出信号計測部11cの出力は、被計測ガス1に含まれる酸素の濃度を計測する基礎情報として酸素濃度計測手段15に入力される。   The hydrogen oxygen detection unit 11 shows a result of detecting hydrogen contained in the measurement target gas 1 and a hydrogen oxygen detection unit 11a that provides the hydrogen detection function and the oxygen detection function of the hydrogen oxygen detection means. A hydrogen detection signal measurement unit 11b that measures the signal level of the hydrogen detection signal, and an oxygen detection signal measurement unit that measures the signal level of the oxygen detection signal that the hydrogen oxygen detection unit 11a obtains as a result of detecting oxygen contained in the gas 1 to be measured. 11c. The output of the hydrogen detection signal measuring unit 11b is input to the hydrogen concentration measuring unit 13 as basic information for measuring the concentration of hydrogen contained in the measurement target gas 1. The output of the oxygen detection signal measuring unit 11c is input to the oxygen concentration measuring means 15 as basic information for measuring the concentration of oxygen contained in the gas 1 to be measured.

水素濃度計測手段13は、例えば、プロセッサ等の演算処理手段によって構成される。水素濃度計測手段13は、水素酸素検出部11aが検出する被計測ガス1に含まれる水素ガスの濃度(水素濃度)に対する水素酸素検出部11aに発生する電流(水素検出信号)を記録したデータである水素濃度計測用データ12を参照する一方、水素検出信号計測部11bからは電気的物理量の一例である水素検出信号計測部11bの出力値(水素検出信号の信号レベルを示す電流値)を得る。   The hydrogen concentration measuring means 13 is constituted by arithmetic processing means such as a processor, for example. The hydrogen concentration measuring means 13 is data in which a current (hydrogen detection signal) generated in the hydrogen oxygen detector 11a with respect to the concentration of hydrogen gas (hydrogen concentration) contained in the measurement gas 1 detected by the hydrogen oxygen detector 11a is recorded. While referring to certain hydrogen concentration measurement data 12, an output value (current value indicating the signal level of the hydrogen detection signal) of the hydrogen detection signal measurement unit 11b, which is an example of an electrical physical quantity, is obtained from the hydrogen detection signal measurement unit 11b. .

水素濃度計測手段13は、水素濃度計測用データ12を参照し、得られる水素検出信号計測部11bの出力値に対応する水素濃度を特定する。特定された水素濃度の情報は、被計測ガス1に含まれる水素濃度の計測結果の情報として、酸素濃度計測手段15と水素濃度計測結果を出力する出力装置17へ与えられる。   The hydrogen concentration measuring means 13 refers to the hydrogen concentration measurement data 12 and specifies the hydrogen concentration corresponding to the output value of the obtained hydrogen detection signal measuring unit 11b. The specified hydrogen concentration information is given to the oxygen concentration measuring means 15 and the output device 17 that outputs the hydrogen concentration measurement result as information on the measurement result of the hydrogen concentration contained in the gas 1 to be measured.

酸素濃度計測手段15は、例えば、プロセッサ等の演算処理手段によって構成される。酸素濃度計測手段15は、水素酸素検出部11aで検出される被計測ガス1に含まれる酸素ガスの濃度(酸素濃度)に対する水素酸素検出部11aに生じる起電力(酸素検出信号)を、被計測ガス1に含まれる水素濃度に応じて記録したデータである酸素濃度計測用データ14を参照する一方、水素濃度計測手段13からは被計測ガス1に含まれる水素濃度の情報を取得し、酸素検出信号計測部11cからは電気的物理量の一例である酸素検出信号計測部11cの出力値(酸素検出信号の信号レベルを示す電圧値)を得る。   The oxygen concentration measuring means 15 is constituted by arithmetic processing means such as a processor, for example. The oxygen concentration measuring means 15 measures the electromotive force (oxygen detection signal) generated in the hydrogen oxygen detector 11a with respect to the concentration (oxygen concentration) of the oxygen gas contained in the measurement gas 1 detected by the hydrogen oxygen detector 11a. While referring to the oxygen concentration measurement data 14 which is data recorded according to the hydrogen concentration contained in the gas 1, information on the hydrogen concentration contained in the measured gas 1 is obtained from the hydrogen concentration measuring means 13 to detect oxygen. An output value (voltage value indicating the signal level of the oxygen detection signal) of the oxygen detection signal measurement unit 11c, which is an example of an electrical physical quantity, is obtained from the signal measurement unit 11c.

酸素濃度計測手段15は、酸素濃度計測用データ14を参照し、取得した被計測ガス1に含まれる水素濃度の場合において最も適当な1個の被計測ガス1に含まれる酸素濃度と水素酸素検出部11aに生じる起電力(酸素検出信号)との関係を示すデータを取得する。その後、酸素濃度計測手段15は、取得した最も適当な1個のデータにおいて酸素検出信号計測部11cの出力値に対応する酸素濃度を特定する。特定された酸素濃度の情報は、酸素濃度計測結果を出力する出力装置17へ与えられる。   The oxygen concentration measurement means 15 refers to the oxygen concentration measurement data 14 and detects the oxygen concentration and hydrogen oxygen contained in the most suitable gas 1 to be measured in the case of the hydrogen concentration contained in the acquired gas 1 to be measured. Data indicating a relationship with an electromotive force (oxygen detection signal) generated in the unit 11a is acquired. Thereafter, the oxygen concentration measuring means 15 specifies the oxygen concentration corresponding to the output value of the oxygen detection signal measuring unit 11c in the most appropriate one acquired data. The specified oxygen concentration information is given to the output device 17 that outputs the oxygen concentration measurement result.

続いて、水素酸素濃度計測に使用される水素濃度計測用データ12および酸素濃度計測用データ14について説明する。   Subsequently, the hydrogen concentration measurement data 12 and the oxygen concentration measurement data 14 used for hydrogen oxygen concentration measurement will be described.

図2は水素酸素濃度計測装置10の水素濃度計測用データ12の一例を示す説明図であり、図3は水素酸素濃度計測装置10の酸素濃度計測用データ14の一例を示す説明図である。   FIG. 2 is an explanatory diagram showing an example of the hydrogen concentration measurement data 12 of the hydrogen oxygen concentration measurement device 10, and FIG. 3 is an explanatory diagram of an example of the oxygen concentration measurement data 14 of the hydrogen oxygen concentration measurement device 10.

水素濃度計測用データ12(図2)は、被計測ガスの水素濃度X[%](図2横軸)に対する水素検出信号としての電流I(図2縦軸)との関係を示すデータであり、電流I(図2縦軸)は水素濃度X[%](図2横軸)と比例関係にある。図2に示されるグラフにおいて、電流Iは原点を通る直線、すなわち、I=aX(aは比例定数、a≒0)の式で規定される一次関数として表すことができる。水素酸素濃度計測装置10では、I=aXの関係を利用して、水素検出信号計測部11bの出力値、すなわち、水素酸素検出部11aに発生する電流(水素検出信号)の信号レベルから被計測ガスに含まれる水素濃度が計測される。   The hydrogen concentration measurement data 12 (FIG. 2) is data showing the relationship between the current I (vertical axis in FIG. 2) as a hydrogen detection signal with respect to the hydrogen concentration X [%] (horizontal axis in FIG. 2) of the gas to be measured. The current I (vertical axis in FIG. 2) is proportional to the hydrogen concentration X [%] (horizontal axis in FIG. 2). In the graph shown in FIG. 2, the current I can be expressed as a straight line passing through the origin, that is, as a linear function defined by an expression of I = aX (a is a proportionality constant, a≈0). The hydrogen oxygen concentration measuring apparatus 10 uses the relationship of I = aX to measure from the output value of the hydrogen detection signal measurement unit 11b, that is, the signal level of the current (hydrogen detection signal) generated in the hydrogen oxygen detection unit 11a. The concentration of hydrogen contained in the gas is measured.

酸素濃度計測用データ14(図3)は、被計測ガスの酸素濃度Y[%](図3横軸)に対する酸素検出信号としての起電力V(図3縦軸)との関係を示すデータであり、起電力V(図3縦軸)は、酸素濃度Y[%](図3横軸)の一次関数である。図3に示されるグラフにおいて、起電力Vは、(Y,V)=(0,V)を通る直線で表される。また、水素酸素検出部11aで検出される酸素検出信号は、被計測ガスに含まれる水素濃度によって変化し、被計測ガスに含まれる水素濃度が0%から高くなるほど、酸素濃度が同じだけ増加または減少しても起電力の変化はより大きくなる。 The oxygen concentration measurement data 14 (FIG. 3) is data indicating the relationship between the oxygen concentration Y [%] (the horizontal axis in FIG. 3) of the gas to be measured and the electromotive force V (the vertical axis in FIG. 3) as an oxygen detection signal. The electromotive force V (vertical axis in FIG. 3) is a linear function of the oxygen concentration Y [%] (horizontal axis in FIG. 3). In the graph shown in FIG. 3, the electromotive force V is represented by a straight line passing through (Y, V) = (0, V 0 ). The oxygen detection signal detected by the hydrogen oxygen detector 11a changes depending on the hydrogen concentration contained in the measurement gas, and the oxygen concentration increases by the same amount as the hydrogen concentration contained in the measurement gas increases from 0% or Even if it decreases, the change in electromotive force becomes larger.

より具体的に説明すると、図3に示されるグラフでは、被計測ガスの酸素濃度に対する起電力(酸素検出信号)を示す直線L0(水素濃度0%の場合)、L1(水素濃度X%の場合)、L2(水素濃度X%の場合)、L3(水素濃度X%の場合)は、右下がりの直線であり、X,X,XがX<X<Xを満たす正数の場合、直線L0の傾きが最も緩く、直線L3の傾きが最も急になっている。 More specifically, in the graph shown in FIG. 3, straight lines L0 (when the hydrogen concentration is 0%) and L1 (hydrogen concentration X 1 %) indicating the electromotive force (oxygen detection signal) with respect to the oxygen concentration of the gas to be measured. ), L2 (in the case of hydrogen concentration X 2 %), and L3 (in the case of hydrogen concentration X 3 %) are straight downwards, and X 1 , X 2 and X 3 are X 1 <X 2 <X 3 In the case of positive numbers satisfying the above, the slope of the straight line L0 is the slowest and the slope of the straight line L3 is the steepest.

このように、被計測ガスの酸素濃度に対する起電力(酸素検出信号)は、被計測ガスの水素濃度に応じて変化する特性があるため、被計測ガス中に水素が混在し得る環境下で適用する場合には、水素が混在しない、または水素濃度が変化しないことを前提とし、水素濃度の変化を考慮しない計測を行うと誤差を生じてしまう。そこで、水素酸素濃度計測装置10では、被計測ガスの酸素濃度に対する起電力(酸素検出信号)を、例えば、0%等のある特定の水素濃度に対する1個のデータだけでなく、想定される範囲内の異なる被計測ガスの水素濃度に対して、それぞれデータを用意しておき、被計測ガス中に水素濃度を考慮した最も適当な1個の被計測ガスの酸素濃度に対する起電力のデータが選択されるようにする。当該データの選択は、いわば、被計測ガス中に水素濃度を考慮した誤差の補正処理である。   As described above, the electromotive force (oxygen detection signal) with respect to the oxygen concentration of the gas to be measured has a characteristic that changes according to the hydrogen concentration of the gas to be measured, and therefore is applied in an environment where hydrogen can be mixed in the gas to be measured. In this case, assuming that no hydrogen is mixed or the hydrogen concentration does not change, an error occurs if measurement is performed without considering the change in the hydrogen concentration. Therefore, in the hydrogen oxygen concentration measuring apparatus 10, the electromotive force (oxygen detection signal) with respect to the oxygen concentration of the gas to be measured is assumed not only to one data for a specific hydrogen concentration such as 0% but also to an assumed range. Data is prepared for each of the hydrogen concentrations of different gases to be measured, and the most appropriate electromotive force data for the oxygen concentration of one gas to be measured is selected in consideration of the hydrogen concentration in the gas to be measured. To be. The selection of the data is so-called error correction processing in consideration of the hydrogen concentration in the gas to be measured.

水素酸素濃度計測装置10では、酸素濃度計測手段15が、被計測ガスの水素濃度が幾つかの異なる水素濃度(例えば、0%,X%,X%,X%)の場合におけるデータを有する酸素濃度計測用データ14を参照し、水素濃度計測手段13によって特定される水素濃度の場合において最も適当な1個の被計測ガス1に含まれる酸素濃度と酸素検出信号との関係を示すデータを取得する。ここで、最も適当な1個の被計測ガス1に含まれる酸素濃度と酸素検出信号との関係を示すデータとは、水素濃度計測手段13によって特定される水素濃度の場合における酸素濃度と酸素検出信号との関係を示すデータである。 In the hydrogen oxygen concentration measuring apparatus 10, the data when the oxygen concentration measuring means 15 has several different hydrogen concentrations (for example, 0%, X 1 %, X 2 %, X 3 %) of the gas to be measured. The relationship between the oxygen concentration contained in the most suitable gas 1 to be measured and the oxygen detection signal in the case of the hydrogen concentration specified by the hydrogen concentration measuring means 13 is shown with reference to the oxygen concentration measurement data 14 having Get the data. Here, the data indicating the relationship between the oxygen concentration contained in the most appropriate gas 1 to be measured and the oxygen detection signal is the oxygen concentration and oxygen detection in the case of the hydrogen concentration specified by the hydrogen concentration measuring means 13. It is data indicating a relationship with a signal.

但し、酸素濃度計測用データ14には、水素濃度計測手段13によって特定される水素濃度と合致する水素濃度の場合の被計測ガス1に含まれる酸素濃度と酸素検出信号との関係を示すデータが含まれていない場合も起こり得る。この場合には、酸素濃度計測用データ14が有している他の水素濃度におけるデータを用いてデータを補間する等することによって、水素濃度計測手段13によって特定される水素濃度の場合の被計測ガス1に含まれる酸素濃度に対する酸素検出信号の関係を示すデータを取得することができる。   However, the oxygen concentration measurement data 14 includes data indicating the relationship between the oxygen concentration contained in the measured gas 1 and the oxygen detection signal when the hydrogen concentration matches the hydrogen concentration specified by the hydrogen concentration measuring means 13. It can happen even if it is not included. In this case, the data to be measured in the case of the hydrogen concentration specified by the hydrogen concentration measuring means 13 by, for example, interpolating the data using data at other hydrogen concentrations possessed by the oxygen concentration measurement data 14. Data indicating the relationship of the oxygen detection signal to the oxygen concentration contained in the gas 1 can be acquired.

例えば、図3に示される酸素濃度計測用データ14の例では、0%,X%,X%,X%の場合の酸素濃度と酸素検出信号との関係を示すデータが記録されているが、水素濃度計測手段13によって特定される水素濃度XがXとXとの中間値、すなわち、X=(X+X)/2の場合、酸素濃度計測手段15は、直線L1で表されるデータと直線L2で表されるデータとを用いて、傾きが直線L1の傾きと直線L2の傾きとの平均値、切片がVとなる一次関数の式を取得する。そして、酸素濃度計測手段15は、取得した式と酸素検出信号の信号レベルとを用いて、酸素検出信号の信号レベルに対応する酸素濃度、すなわち、被計測ガス1に含まれる酸素濃度を特定する。 For example, in the example of the oxygen concentration measurement data 14 shown in FIG. 3, data indicating the relationship between the oxygen concentration and the oxygen detection signal in the case of 0%, X 1 %, X 2 %, and X 3 % is recorded. However, when the hydrogen concentration X specified by the hydrogen concentration measuring means 13 is an intermediate value between X 1 and X 2 , that is, X = (X 1 + X 2 ) / 2, the oxygen concentration measuring means 15 has a straight line L1. in using the data represented by the data and the straight line L2 represented, slope average value of the gradient of the slope and the straight line L2 of the straight line L1, to obtain the equation of a linear function intercept is V 0. Then, the oxygen concentration measuring means 15 specifies the oxygen concentration corresponding to the signal level of the oxygen detection signal, that is, the oxygen concentration contained in the measurement target gas 1, using the acquired equation and the signal level of the oxygen detection signal. .

図4は、水素酸素濃度計測装置10(図1)における水素酸素検出手段としての水素酸素検出ユニット11の構成を示す概略図である。   FIG. 4 is a schematic diagram showing a configuration of a hydrogen oxygen detection unit 11 as hydrogen oxygen detection means in the hydrogen oxygen concentration measuring apparatus 10 (FIG. 1).

水素酸素検出ユニット11は、比較ガス導入部21と、被計測ガス導入部22と、比較ガス導入部21と被計測ガス導入部22との間に設けられる酸素イオン伝導部23とを備え、例えば白金で構成される電極25(25a,25b,25c)が比較ガス導入部21と被計測ガス導入部22とに配設される。また、被計測ガス導入部22の前段には吸気される被計測ガスを必要時に加熱するヒータ24が設けられる。   The hydrogen oxygen detection unit 11 includes a comparison gas introduction unit 21, a measurement gas introduction unit 22, and an oxygen ion conduction unit 23 provided between the comparison gas introduction unit 21 and the measurement gas introduction unit 22, for example. Electrodes 25 (25a, 25b, 25c) made of platinum are disposed in the comparative gas introduction part 21 and the measurement gas introduction part 22. In addition, a heater 24 that heats the inhaled measurement gas when necessary is provided in front of the measurement gas introduction unit 22.

また、水素酸素検出ユニット11は、酸素イオン伝導部23における酸素イオンの伝導作用によって、酸素イオン伝導部23に取り付けられる電極25a,25bの間に生じる起電力を計測する電圧計26を接続した電圧計測回路27と、電極25bの抵抗値の変化に伴い生じる電流を計測する電流計28を接続した電流計測回路29とを備える。電圧計26が得た電圧値の情報は、酸素検出信号の信号レベルを示す数値情報として酸素濃度計測手段15へ与えられ、電流計28が得た電流値の情報は、水素検出信号の信号レベルを示す数値情報として水素濃度計測手段13へ与えられる。   In addition, the hydrogen oxygen detection unit 11 has a voltage connected to a voltmeter 26 that measures an electromotive force generated between the electrodes 25 a and 25 b attached to the oxygen ion conduction unit 23 by the conduction action of oxygen ions in the oxygen ion conduction unit 23. A measurement circuit 27 and a current measurement circuit 29 connected to an ammeter 28 for measuring a current generated with a change in the resistance value of the electrode 25b are provided. The voltage value information obtained by the voltmeter 26 is given to the oxygen concentration measuring means 15 as numerical information indicating the signal level of the oxygen detection signal, and the current value information obtained by the ammeter 28 is the signal level of the hydrogen detection signal. Is given to the hydrogen concentration measuring means 13 as numerical information indicating

比較ガス導入部21は、比較ガスが導入される領域であり、外部との吸気および排気を行う吸気部21aと排気部21bとが設けられている。また、比較ガス導入部21には、比較ガスが導入された場合に比較ガスに曝される電極25aが配設される。   The comparative gas introduction part 21 is an area into which the comparative gas is introduced, and is provided with an intake part 21a and an exhaust part 21b for performing intake and exhaust with the outside. In addition, the reference gas introduction unit 21 is provided with an electrode 25a that is exposed to the comparison gas when the comparison gas is introduced.

ここで、比較ガスとは、濃度計測のために必要となる、被計測ガスとは異なるガスである。比較ガスは、任意のガスから選択することができるが、計測中に気温および湿度が変化しない性質のガスである方が好ましい。比較ガスとしては、例えば、空気やアルゴンなどの希ガスを用いることができる。   Here, the reference gas is a gas different from the measurement target gas required for concentration measurement. The reference gas can be selected from any gas, but is preferably a gas that does not change in temperature and humidity during measurement. As the reference gas, for example, a rare gas such as air or argon can be used.

被計測ガス導入部22は、被計測ガスが導入される領域であり、外部との吸気および排気を行う吸気部22aと排気部22bとが設けられている。また、被計測ガス導入部22には、被計測ガスが導入された場合に被計測ガスに曝される2個の電極25b,25cが配設される。   The gas to be measured introduction unit 22 is an area into which the gas to be measured is introduced, and is provided with an intake unit 22a and an exhaust unit 22b that perform intake and exhaust with the outside. Further, the measurement gas introduction unit 22 is provided with two electrodes 25b and 25c that are exposed to the measurement gas when the measurement gas is introduced.

酸素イオン伝導部23は、例えばジルコニアなどの酸素イオン伝導性の固体電解物質体等で構成される酸素イオン伝導体を備える。酸素イオン伝導体には、比較ガス導入部21の内部に比較ガスが導入された場合に比較ガスに曝される電極25aと、被計測ガス導入部22の内部に被計測ガスが導入された場合に被計測ガスに曝される電極25bとが取り付けられており、電極25aと電極25bと間には、酸素イオンの伝導に起因して起電力(電位差)が生じる。酸素イオン伝導部23で生じる起電力は、電極25aと電極25bと間の電位差として電圧計26によって計測される。   The oxygen ion conductive portion 23 includes an oxygen ion conductor made of an oxygen ion conductive solid electrolyte material such as zirconia. In the oxygen ion conductor, when the reference gas is introduced into the reference gas introduction unit 21, the electrode 25 a exposed to the comparison gas, and when the measurement gas is introduced into the measurement gas introduction unit 22 An electrode 25b exposed to the gas to be measured is attached, and an electromotive force (potential difference) is generated between the electrode 25a and the electrode 25b due to conduction of oxygen ions. The electromotive force generated in the oxygen ion conducting portion 23 is measured by the voltmeter 26 as a potential difference between the electrode 25a and the electrode 25b.

電極25aは、比較ガス導入部21の内部に比較ガスが導入された場合に比較ガスに曝される一方、酸素イオン伝導体に取り付けられている。電極25bは、比較ガス導入部21と酸素イオン伝導部23を介在して配設される被計測ガス導入部22の内部に被計測ガスが導入された場合に被計測ガスに曝される一方、酸素イオン伝導体を介して電極25aと対向する位置に取り付けられる。電極25cは、被計測ガスが被計測ガス導入部22に導入された場合に電極25bとともに被計測ガスに曝される一方、水素ガスによる燃焼を防止し、抵抗値が変化するのを防止する観点から、燃焼防止のためのコーティング処理が実施され、燃焼防止のコーティングが施されている。   The electrode 25a is attached to the oxygen ion conductor while being exposed to the comparison gas when the comparison gas is introduced into the comparison gas introduction portion 21. The electrode 25b is exposed to the gas to be measured when the gas to be measured is introduced into the gas to be measured introduction portion 22 disposed with the reference gas introduction portion 21 and the oxygen ion conducting portion 23 interposed therebetween. It is attached at a position facing the electrode 25a through an oxygen ion conductor. The electrode 25c is exposed to the gas to be measured together with the electrode 25b when the gas to be measured is introduced into the gas to be measured introduction section 22, while preventing combustion by hydrogen gas and preventing the resistance value from changing. Therefore, a coating treatment for preventing combustion is performed, and a coating for preventing combustion is applied.

従って、図4に示される水素酸素検出ユニット11では、被計測ガスが導入された場合に被計測ガスに曝される電極25b,25cのうち、表面に燃焼防止のためのコーティングが施される電極25cでは、燃焼が防止されて抵抗値は変化しない一方で、表面に燃焼防止のためのコーティングが施されていない電極25bの表面では、接触燃焼の発生に伴って抵抗値が変化する。   Therefore, in the hydrogen-oxygen detection unit 11 shown in FIG. 4, of the electrodes 25b and 25c exposed to the gas to be measured when the gas to be measured is introduced, an electrode whose surface is coated for preventing combustion. In 25c, combustion is prevented and the resistance value does not change. On the other hand, on the surface of the electrode 25b on which the coating for preventing combustion is not applied, the resistance value changes with the occurrence of contact combustion.

電圧計測回路27は、酸素イオン伝導部23に生じる起電力、すなわち、電極25aと電極25bとの間の電圧(電位差)を計測するための回路であり、電圧計26によって電極25aと電極25bとの間の電位差が計測される。電圧計26によって計測された計測結果(電圧値の情報)は、電圧計26から酸素濃度計測手段15へ出力される。   The voltage measuring circuit 27 is a circuit for measuring an electromotive force generated in the oxygen ion conducting portion 23, that is, a voltage (potential difference) between the electrode 25a and the electrode 25b. The voltmeter 26 uses the electrode 25a and the electrode 25b. The potential difference between is measured. The measurement result (voltage value information) measured by the voltmeter 26 is output from the voltmeter 26 to the oxygen concentration measuring means 15.

電流計測回路29は、例えば、抵抗値が既知の抵抗体31a,31bを2個と、抵抗値が既知の電極25b,25cとをブリッジ状に接続し、初期状態(計測前)で平衡条件を満たすブリッジ部32と、ブリッジ部32の接点x−y間に定電圧を印加する定電圧回路33と、ブリッジ部32の接点w−z間を流れる電流を計測する電流計28を接続して構成される。   For example, the current measurement circuit 29 connects two resistors 31a and 31b with known resistance values and electrodes 25b and 25c with known resistance values in a bridge shape, and sets the equilibrium condition in an initial state (before measurement). A bridge unit 32 that is filled, a constant voltage circuit 33 that applies a constant voltage between the contacts xy of the bridge unit 32, and an ammeter 28 that measures the current flowing between the contacts wz of the bridge unit 32 are connected. Is done.

初期状態では、ブリッジ部32が平衡条件を満たしており、電流計28の指示値は0となる。一方、被計測ガスが導入されると、被計測ガスに曝される電極25b,25cのうち、水素ガスによる燃焼を防止するコーティングが施されていない電極25bでは、燃焼により抵抗値が変化する一方で、水素ガスによる燃焼を防止するコーティングが施されている電極25cは抵抗値が変化しない。この結果、ブリッジ部32の平衡は崩れ(不平衡状態となり)、電流計28に電流が流れる。被計測ガスが導入された後に、電流計28によって計測された計測結果(電流値の情報)は、電流計28から水素濃度計測手段13へ出力される。   In the initial state, the bridge unit 32 satisfies the equilibrium condition, and the indicated value of the ammeter 28 is zero. On the other hand, when the gas to be measured is introduced, among the electrodes 25b and 25c that are exposed to the gas to be measured, the resistance value of the electrode 25b that is not coated with hydrogen gas to prevent combustion changes due to combustion. Thus, the resistance value of the electrode 25c on which the coating for preventing combustion by hydrogen gas is applied does not change. As a result, the balance of the bridge portion 32 is lost (becomes unbalanced), and a current flows through the ammeter 28. After the gas to be measured is introduced, the measurement result (current value information) measured by the ammeter 28 is output from the ammeter 28 to the hydrogen concentration measuring means 13.

このように、水素酸素濃度計測装置10の水素酸素検出手段としての水素酸素検出ユニット11は、比較ガス導入部21に配設される電極25a、並びに被計測ガス導入部22に配設され、導入される被計測ガスに曝される電極25b,25cのうちの一方の電極である電極25bが取り付けられる酸素イオン伝導部23を、比較ガス導入部21と被計測ガス導入部22との間に介在させて構成される1個のユニットであり、被計測ガス導入部22に導入する被計測ガス中の水素および酸素を検出する。   As described above, the hydrogen oxygen detection unit 11 as the hydrogen oxygen detection means of the hydrogen oxygen concentration measuring apparatus 10 is provided in the electrode 25a provided in the comparison gas introduction unit 21 and the measurement gas introduction unit 22, and is introduced. An oxygen ion conducting portion 23 to which the electrode 25b, which is one of the electrodes 25b and 25c exposed to the measurement gas to be measured, is attached is interposed between the comparison gas introduction portion 21 and the measurement gas introduction portion 22. This is a single unit configured to detect hydrogen and oxygen in the measurement target gas introduced into the measurement target gas introduction unit 22.

被計測ガス中の水素および酸素の濃度を計測する際には、被計測ガスを被計測ガス導入部22に導入するとともに、比較ガス導入部21には比較ガスを導入して行う。被計測ガス導入部22に被計測ガスが導入される一方、比較ガス導入部21に比較ガスが導入されると、被計測ガス中の水素濃度および酸素濃度に応じた出力が得られる。すなわち、被計測ガス中の水素および酸素が検出される。   When measuring the concentrations of hydrogen and oxygen in the gas to be measured, the gas to be measured is introduced into the gas to be measured introduction unit 22 and the comparison gas introduction unit 21 is introduced with a reference gas. When the measurement gas is introduced into the measurement gas introduction unit 22 and the comparison gas is introduced into the comparison gas introduction unit 21, an output corresponding to the hydrogen concentration and the oxygen concentration in the measurement gas is obtained. That is, hydrogen and oxygen in the measurement gas are detected.

ここで、水素の検出は、電流計測回路29によって行われる。電流計測回路29では、被計測ガスを被計測ガス導入部22に導入した後の電流計28の指示値(電流値の情報)が読み取られる。電流計28の指示値(電流値の情報)は、検出結果として電流計28から水素濃度計測手段13へ出力される。   Here, the detection of hydrogen is performed by the current measuring circuit 29. In the current measurement circuit 29, the indicated value (current value information) of the ammeter 28 after the measurement gas is introduced into the measurement gas introduction unit 22 is read. The indicated value (current value information) of the ammeter 28 is output from the ammeter 28 to the hydrogen concentration measuring means 13 as a detection result.

一方、酸素の検出は、電圧計測回路27によって行われる。電圧計測回路27では、被計測ガスを被計測ガス導入部22に導入した後の電圧計26の指示値(電圧値の情報)が読み取られる。電圧計26の指示値(電圧値の情報)は、電圧計26から酸素濃度計測手段15へ出力される。   On the other hand, the detection of oxygen is performed by the voltage measurement circuit 27. The voltage measurement circuit 27 reads the indicated value (voltage value information) of the voltmeter 26 after the measurement gas is introduced into the measurement gas introduction unit 22. The indication value (voltage value information) of the voltmeter 26 is output from the voltmeter 26 to the oxygen concentration measuring means 15.

すなわち、水素酸素検出ユニット11では、比較ガス導入部21に配設され、かつ、酸素イオン伝導部23の一端に取り付けられる電極25aと、被計測ガス導入部22に配設され、かつ、酸素イオン伝導部23の他端に取り付けられる電極25bと、被計測ガス導入部22に配設され、燃焼防止のためのコーティング処理が施されている電極25cとが、水素酸素検出部11aとして機能し、電流計測回路29が水素検出信号計測部11bとして機能し、電圧計測回路27が酸素検出信号計測部11cとして機能する。   That is, in the hydrogen oxygen detection unit 11, the electrode 25 a that is disposed in the comparison gas introduction unit 21 and attached to one end of the oxygen ion conduction unit 23, the measurement gas introduction unit 22, and the oxygen ion An electrode 25b attached to the other end of the conduction part 23 and an electrode 25c disposed in the measurement gas introduction part 22 and subjected to a coating treatment for preventing combustion function as the hydrogen oxygen detection part 11a. The current measurement circuit 29 functions as the hydrogen detection signal measurement unit 11b, and the voltage measurement circuit 27 functions as the oxygen detection signal measurement unit 11c.

なお、上述した水素酸素検出ユニット11は、ヒータ24を備える例であるが、必ずしもヒータ24を備えている必要なく、省略することもできる。例えば、ヒータ24を水素酸素検出ユニット11と別ユニットとして水素酸素濃度計測装置10を構成することもできる。また、水素酸素濃度計測装置10とは別装置としてヒータ24を追設することもできる。   In addition, although the hydrogen oxygen detection unit 11 mentioned above is an example provided with the heater 24, it does not necessarily need to be provided with the heater 24 and can also be abbreviate | omitted. For example, the hydrogen oxygen concentration measuring apparatus 10 can be configured with the heater 24 as a separate unit from the hydrogen oxygen detection unit 11. Further, a heater 24 can be additionally provided as a separate device from the hydrogen oxygen concentration measuring device 10.

また、被計測ガスの温度を監視する温度監視手段(図5に示される温度監視手段53に相当)を追設したり、ヒータ24を制御するヒータ制御手段(図5に示されるヒータ制御手段54に相当)を追設したり、被計測ガスに含まれる酸素濃度の異常を報知する発報手段(図5に示される発報手段56に相当)を追設したり、ヒータ24の故障を検知する故障検知手段(図5に示される故障検知手段57に相当)を追設したりして、水素酸素検出ユニット11、および水素酸素検出ユニット11を備える水素酸素濃度計測装置10(図1)を構成することもできる。   Further, temperature monitoring means for monitoring the temperature of the gas to be measured (corresponding to the temperature monitoring means 53 shown in FIG. 5) is additionally provided, or heater control means for controlling the heater 24 (heater control means 54 shown in FIG. 5). Or a reporting means (equivalent to the reporting means 56 shown in FIG. 5) for notifying the abnormality of the oxygen concentration contained in the gas to be measured, or detecting a failure of the heater 24. A failure detection means (corresponding to the failure detection means 57 shown in FIG. 5) is installed, and the hydrogen oxygen detection unit 11 and the hydrogen oxygen concentration measuring device 10 (FIG. 1) including the hydrogen oxygen detection unit 11 are provided. It can also be configured.

このように構成される水素酸素濃度計測装置10(図1)によれば、被計測ガス1に含まれる複数種類の可燃性ガスである水素および酸素を一度に検出する水素酸素検出手段としての水素酸素検出ユニット11を備えるため、被計測ガス1に含まれる水素および酸素等の複数種類の可燃性ガスを一度に検出することができる。そのため、水素酸素濃度計測装置10では、例えば、水素濃度を計測する計測ユニットと酸素濃度を計測する計測ユニットとを別々に備える等の異なる2個の計測ユニットを備えることなく、1個の計測ユニットを備えることによって、水素と酸素との異なる可燃性ガスの濃度を一度に検出し、その濃度を計測することができる。   According to the thus configured hydrogen oxygen concentration measuring device 10 (FIG. 1), hydrogen as hydrogen oxygen detecting means for detecting hydrogen and oxygen, which are a plurality of types of combustible gases contained in the gas 1 to be measured, at a time. Since the oxygen detection unit 11 is provided, a plurality of types of combustible gases such as hydrogen and oxygen contained in the measurement gas 1 can be detected at a time. Therefore, in the hydrogen oxygen concentration measurement device 10, for example, one measurement unit is provided without two different measurement units such as separately including a measurement unit for measuring the hydrogen concentration and a measurement unit for measuring the oxygen concentration. , The concentration of the combustible gas different between hydrogen and oxygen can be detected at once and the concentration can be measured.

また、水素酸素濃度計測装置10では、従来の水素および酸素の濃度計測が可能な濃度計測装置と比べて、計測ユニットの数を1個に減らすことができ、また、被計測ガス1のサンプリングなどを要することなく高精度で酸素濃度を計測することができるので、サンプリングに必要な機器および電力を省くことができる。   Further, in the hydrogen oxygen concentration measuring apparatus 10, the number of measurement units can be reduced to one as compared with the conventional concentration measuring apparatus capable of measuring the concentration of hydrogen and oxygen, and the sampled gas 1 is sampled. Since the oxygen concentration can be measured with high accuracy without the necessity of equipment, it is possible to omit equipment and power necessary for sampling.

さらに、水素酸素濃度計測装置10では、被計測ガス1に含まれる水素濃度が変化する環境下で酸素濃度を計測する場合においても、被計測ガス1に含まれる水素濃度を考慮した被計測ガス1に含まれる酸素濃度と酸素検出信号との関係を示す最適なデータを1個取得することによって、計測される酸素濃度に対して実質的な誤差の補正処理が行われるので、被計測ガス1に含まれる高精度に酸素濃度を計測することができる。   Further, in the hydrogen oxygen concentration measuring apparatus 10, even when the oxygen concentration is measured in an environment where the hydrogen concentration contained in the measurement gas 1 changes, the measurement gas 1 taking into account the hydrogen concentration contained in the measurement gas 1. By acquiring one optimum data indicating the relationship between the oxygen concentration contained in the gas and the oxygen detection signal, a substantial error correction process is performed on the measured oxygen concentration. It is possible to measure the oxygen concentration with high accuracy.

次に、本発明の実施形態に係る水素酸素濃度計測システム、すなわち、本発明の実施形態に係る水素酸素濃度計測装置を適用した水素酸素濃度計測システムについて説明する。   Next, a hydrogen oxygen concentration measuring system according to an embodiment of the present invention, that is, a hydrogen oxygen concentration measuring system to which a hydrogen oxygen concentration measuring apparatus according to an embodiment of the present invention is applied will be described.

図5は、本発明の実施形態に係る水素酸素濃度計測システムの一例である水素酸素濃度計測システム50の構成を示す概略図である。なお、図5において、水素酸素濃度計測装置10(図1)が、水素および酸素の濃度計測に使用する水素濃度計測用データ12(図1)および酸素濃度計測用データ14を省略して示す。   FIG. 5 is a schematic diagram illustrating a configuration of a hydrogen oxygen concentration measurement system 50 which is an example of a hydrogen oxygen concentration measurement system according to an embodiment of the present invention. In FIG. 5, the hydrogen concentration measurement apparatus 10 (FIG. 1) omits the hydrogen concentration measurement data 12 (FIG. 1) and the oxygen concentration measurement data 14 used for measuring the hydrogen and oxygen concentrations.

図5に示される水素酸素濃度計測システム50は、原子炉格納容器2の内部の雰囲気(被計測ガス)中の酸素濃度または酸素濃度と水素濃度を計測するために用いた場合の一例であり、原子炉格納容器2の内部の雰囲気(被計測ガス)中の酸素濃度および水素濃度を計測するために必要となる構成要素は、適宜、原子炉格納容器2、原子炉建屋3、および中央制御室4の何れかに配置される。ここで、符号5は、格納容器壁6を貫通し、原子炉格納容器2の内側と外側とで、配管やケーブルを接続するペネトレーション装置である。   The hydrogen oxygen concentration measurement system 50 shown in FIG. 5 is an example when used to measure the oxygen concentration or the oxygen concentration and the hydrogen concentration in the atmosphere (the gas to be measured) inside the reactor containment vessel 2, The components necessary for measuring the oxygen concentration and the hydrogen concentration in the atmosphere (the gas to be measured) inside the reactor containment vessel 2 are suitably the reactor containment vessel 2, the reactor building 3, and the central control room. 4 is arranged. Here, reference numeral 5 denotes a penetration device that penetrates the containment vessel wall 6 and connects pipes and cables between the inside and outside of the reactor containment vessel 2.

図5に示される水素酸素濃度計測システム50は、水素酸素濃度計測装置10(図1)に相当する水素酸素検出部11aと、水素検出信号計測部11bと、酸素検出信号計測部11cと、水素濃度計測手段13と、酸素濃度計測手段15とを具備する他、比較ガス供給系51と、校正ガス供給系52と、温度監視手段53と、ヒータ制御手段54と、換算手段55と、発報手段56と、故障検知手段57と、事故時起動手段58とを具備する。   A hydrogen oxygen concentration measuring system 50 shown in FIG. 5 includes a hydrogen oxygen detecting unit 11a, a hydrogen detecting signal measuring unit 11b, an oxygen detecting signal measuring unit 11c, and a hydrogen corresponding to the hydrogen oxygen concentration measuring apparatus 10 (FIG. 1). In addition to the concentration measuring means 13 and the oxygen concentration measuring means 15, the comparison gas supply system 51, the calibration gas supply system 52, the temperature monitoring means 53, the heater control means 54, the conversion means 55, and the alarm Means 56, failure detection means 57, and accident start means 58 are provided.

また、図5に示される水素酸素濃度計測システム50において、被計測ガス中の酸素濃度と水素濃度とを計測する計測点となる水素酸素検出部11aは、被計測ガスが通気可能な防爆容器61で覆われている。水素酸素検出部11aを防爆容器61で覆うことにより、防爆容器61内で水素ガスおよび酸素ガスとで燃焼反応が生じた場合でも、その影響を防爆容器61内に止めることができ、安全性が高められている。従って、原子炉格納容器2の内部の酸素濃度を計測するために水素酸素濃度計測装置10(図1)を適用する際にも、水素酸素検出部11aを防爆容器61で覆うことにより、防爆容器61の外部の空間である原子炉格納容器2に悪影響が及ぶのを防止することができるように図られている。   In the hydrogen oxygen concentration measurement system 50 shown in FIG. 5, the hydrogen oxygen detector 11a serving as a measurement point for measuring the oxygen concentration and the hydrogen concentration in the gas to be measured is an explosion-proof container 61 through which the gas to be measured can be vented. Covered with. By covering the hydrogen / oxygen detector 11a with the explosion-proof container 61, even if a combustion reaction occurs with hydrogen gas and oxygen gas in the explosion-proof container 61, the influence can be stopped in the explosion-proof container 61, and safety is improved. Has been enhanced. Therefore, when applying the hydrogen oxygen concentration measuring device 10 (FIG. 1) to measure the oxygen concentration inside the reactor containment vessel 2, the explosion-proof vessel 61 is covered by covering the hydrogen-oxygen detector 11a with the explosion-proof vessel 61. The reactor containment vessel 2 which is a space outside 61 is prevented from being adversely affected.

ここで、防爆容器61とは、防爆容器61内で水素ガスおよび酸素ガスとで燃焼反応が生じた場合でも、その影響を防爆容器61内に止めることができる防爆機能を有する容器である。防爆容器61の材料は、使用環境下で防爆機能を維持でき、かつ、被計測ガスの通気を妨げない材料から任意に選択することができる。例えば、防爆容器61を多孔質な焼結金属で制作することもできる。この場合、被計測ガスが通気する通気孔を設ける手間を省くことができる。   Here, the explosion-proof container 61 is a container having an explosion-proof function capable of stopping the influence in the explosion-proof container 61 even when a combustion reaction occurs with hydrogen gas and oxygen gas in the explosion-proof container 61. The material of the explosion-proof container 61 can be arbitrarily selected from materials that can maintain the explosion-proof function under the usage environment and do not hinder the flow of the gas to be measured. For example, the explosion-proof container 61 can be made of a porous sintered metal. In this case, the trouble of providing a vent hole through which the gas to be measured is vented can be saved.

防爆容器61の内部には、水素酸素検出部11aの他、被計測ガスを加熱するヒータ24と、原子炉格納容器2の内部の雰囲気である被計測ガスの温度情報となる温度信号を出力する温度検出部62とが収容される。   In addition to the hydrogen / oxygen detector 11a, a heater 24 for heating the gas to be measured and a temperature signal serving as temperature information for the gas to be measured, which is the atmosphere inside the reactor containment vessel 2, are output inside the explosion-proof container 61. The temperature detector 62 is accommodated.

水素酸素濃度計測システム50において、比較ガス供給系51は、水素酸素検出部11a(より詳細には図4に示される比較ガス導入部21)に比較ガスを供給するためのガス供給系である。   In the hydrogen oxygen concentration measurement system 50, the reference gas supply system 51 is a gas supply system for supplying a reference gas to the hydrogen oxygen detector 11a (more specifically, the reference gas introduction unit 21 shown in FIG. 4).

校正ガス供給系52は、水素酸素検出部11a(より詳細には図4に示される被計測ガス導入部22)に校正ガスを供給するためのガス供給系である。校正ガス供給系52は、水素酸素検出部11aの校正時に使用される。   The calibration gas supply system 52 is a gas supply system for supplying a calibration gas to the hydrogen oxygen detection unit 11a (more specifically, the measurement gas introduction unit 22 shown in FIG. 4). The calibration gas supply system 52 is used when the hydrogen oxygen detector 11a is calibrated.

温度監視手段53は、温度検出部62が出力する防爆容器61内の被計測ガス、すなわち、原子炉格納容器2の内部の雰囲気の温度情報を取得し、取得した温度情報が示す原子炉格納容器2の内部の雰囲気の温度に基づき、ヒータ24による加熱の要否を判断する。水素酸素濃度計測システム50では、濃度計測の誤差を少なくする観点から、被計測ガス(水素ガスおよび酸素ガス)の温度を発火点(約570度)以上とするように設定されるため、温度監視手段53は、当該発火点以上で設定される温度(閾値)よりも低い場合にはヒータ24による加熱が必要と判断する。温度監視手段53は、ヒータ24による加熱が必要と判断すると、加熱が必要な旨を示す信号をヒータ制御手段54へ与える。   The temperature monitoring means 53 acquires the gas to be measured in the explosion-proof container 61 output from the temperature detector 62, that is, the temperature information of the atmosphere inside the reactor containment vessel 2, and the reactor containment vessel indicated by the obtained temperature information. 2, whether or not heating by the heater 24 is necessary is determined based on the temperature of the atmosphere inside. In the hydrogen oxygen concentration measurement system 50, the temperature of the gas to be measured (hydrogen gas and oxygen gas) is set to be equal to or higher than the ignition point (about 570 degrees) from the viewpoint of reducing the concentration measurement error. The means 53 determines that heating by the heater 24 is necessary when the temperature is lower than the temperature (threshold value) set above the ignition point. When the temperature monitoring unit 53 determines that heating by the heater 24 is necessary, the temperature monitoring unit 53 gives a signal indicating that heating is necessary to the heater control unit 54.

ヒータ制御手段54は、温度監視手段53に対して、ヒータ24による加熱の要否を判断した結果に基づく信号を、必要時に要求する。ヒータ制御手段54は、温度監視手段53からヒータ24による加熱が必要な旨を示す信号を受け取ると、ヒータ24に対して「入」とする指令を与える一方、加熱が不要な旨を示す信号を受け取ると、ヒータ24に対して「切」とする指令を与える。   The heater control means 54 requests the temperature monitoring means 53 for a signal based on the result of determining whether heating by the heater 24 is necessary when necessary. When the heater control unit 54 receives a signal indicating that heating by the heater 24 is necessary from the temperature monitoring unit 53, the heater control unit 54 gives a command to turn on the heater 24, while receiving a signal indicating that heating is unnecessary. When received, the heater 24 is instructed to turn off.

換算手段55は、原子炉格納容器2内の圧力を計測する圧力計65から出力される圧力情報を取得し、取得する圧力情報が示す原子炉格納容器2内の圧力に基づいて、水素濃度計測手段13から受け取る原子炉格納容器2内の雰囲気(被計測ガス)中の水素濃度の計測結果、および酸素濃度計測手段15から受け取る原子炉格納容器2内の雰囲気(被計測ガス)中の酸素濃度の計測結果の少なくとも一方を、原子炉格納容器2内部の全圧に対する濃度に換算する。   The conversion means 55 acquires pressure information output from the pressure gauge 65 that measures the pressure in the reactor containment vessel 2, and measures the hydrogen concentration based on the pressure in the reactor containment vessel 2 indicated by the acquired pressure information. The measurement result of the hydrogen concentration in the atmosphere (measured gas) in the reactor containment vessel 2 received from the means 13 and the oxygen concentration in the atmosphere (measured gas) in the reactor containment vessel 2 received from the oxygen concentration measuring means 15 At least one of the measurement results is converted into a concentration with respect to the total pressure inside the reactor containment vessel 2.

また、換算手段55は、受け取る被計測ガス中の水素濃度および酸素濃度の計測結果や換算結果を、記録計66、原子炉を監視する監視装置7等の出力装置に出力するとともに、被計測ガス中の酸素濃度が予め設定した濃度(閾値)以上となっている場合に警報器67に発報指令を与える発報手段56へ出力する。   Further, the conversion means 55 outputs the measurement result and conversion result of the hydrogen concentration and oxygen concentration in the received measurement gas to the output device such as the recorder 66 and the monitoring device 7 for monitoring the reactor, and the measurement target gas. When the oxygen concentration in the gas is equal to or higher than a preset concentration (threshold value), the alarm is output to the alarm means 56 that gives an alarm command to the alarm device 67.

発報手段56は、被計測ガス中の酸素濃度が予め設定した濃度(閾値)以上となっている場合に警報器67に発報指令を与える機能を有する。警報器67に発報指令が与えられると、警報器67は被計測ガス中の酸素濃度が予め設定した濃度以上となっている旨の警報を発報する。   The reporting unit 56 has a function of giving a reporting command to the alarm device 67 when the oxygen concentration in the gas to be measured is equal to or higher than a preset concentration (threshold value). When an alarm command is given to the alarm device 67, the alarm device 67 issues an alarm to the effect that the oxygen concentration in the gas to be measured is equal to or higher than a preset concentration.

故障検知手段57および事故時起動手段58は、原子炉格納容器2の内部の雰囲気(被計測ガス)中の酸素濃度または酸素濃度と水素濃度を計測するために用いる場合であって、例えば、監視装置7や原子炉の事故を検知した場合に事故を検知したことを示す信号を出力する事故監視装置8等の原子炉を監視するための機能を有する装置と連動させて動作させる場合等に追設される。   The failure detection means 57 and the accident start means 58 are used for measuring the oxygen concentration or the oxygen concentration and the hydrogen concentration in the atmosphere (gas to be measured) inside the reactor containment vessel 2, for example, monitoring. Added when the system is operated in conjunction with a device having a function for monitoring the reactor, such as the accident monitoring device 8 that outputs a signal indicating that an accident has been detected when the device 7 or a reactor accident is detected. Established.

故障検知手段57は、ヒータ24の故障を検知する機能を有し、ヒータ24の故障を検知すると、ヒータ24の故障を知らせる信号を監視装置7等の出力装置に出力する。監視装置7等の出力装置では、ヒータ24の故障を知らせる信号が受信されると、ヒータ24が故障している旨が表示される。   The failure detection means 57 has a function of detecting a failure of the heater 24 and outputs a signal notifying the failure of the heater 24 to an output device such as the monitoring device 7 when the failure of the heater 24 is detected. When an output device such as the monitoring device 7 receives a signal notifying that the heater 24 has failed, it displays that the heater 24 has failed.

事故時起動手段58は、原子炉の事故を検知した場合に事故を検知したことを示す信号を出力する事故監視装置8からの事故検知信号を受け取ると、ヒータ制御手段54へヒータ制御動作を開始する指令、すなわち、温度監視手段53に対して、ヒータ24による加熱の要否を判断した結果を要求する指令を出力する。   When the accident start means 58 receives an accident detection signal from the accident monitoring device 8 that outputs a signal indicating that an accident has been detected when a nuclear accident has been detected, the heater control means 54 starts a heater control operation. That is, a command for requesting the temperature monitoring means 53 to request the result of determining whether heating by the heater 24 is necessary.

なお、図5に示される水素酸素濃度計測システム50は、水素酸素検出部11aと、水素検出信号計測部11bと、酸素検出信号計測部11cと、水素濃度計測手段13と、酸素濃度計測手段15とを具備する他、比較ガス供給系51と、校正ガス供給系52と、温度監視手段53と、ヒータ制御手段54と、換算手段55と、故障検知手段57と、事故時起動手段58と、発報手段56とを具備し、水素酸素検出部11aを防爆容器61で覆って構成されている例であるが、水素酸素濃度計測システム50は、校正ガス供給系52、温度監視手段53、ヒータ制御手段54、換算手段55、発報手段56、故障検知手段57、および事故時起動手段58を必ずしも具備している必要はなく、省略することもできる。また、水素酸素検出部11aを防爆容器61で覆うことは、安全性をより高めるための安全対策の一例であり、必須の事項ではない。   The hydrogen oxygen concentration measurement system 50 shown in FIG. 5 includes a hydrogen oxygen detection unit 11a, a hydrogen detection signal measurement unit 11b, an oxygen detection signal measurement unit 11c, a hydrogen concentration measurement unit 13, and an oxygen concentration measurement unit 15. A comparison gas supply system 51, a calibration gas supply system 52, a temperature monitoring means 53, a heater control means 54, a conversion means 55, a failure detection means 57, an accident start means 58, The hydrogen oxygen concentration measuring system 50 includes a calibration gas supply system 52, a temperature monitoring means 53, and a heater. The control means 54, the conversion means 55, the reporting means 56, the failure detection means 57, and the accident start means 58 are not necessarily provided, and may be omitted. Moreover, covering the hydrogen oxygen detector 11a with the explosion-proof container 61 is an example of a safety measure for further improving safety, and is not an essential matter.

このように構成される水素酸素濃度計測システム50では、水素酸素検出部11aが原子炉格納容器2内の雰囲気(被計測ガス)を導入する一方、供給される比較ガスも導入される。被計測ガスおよび比較ガスが導入された水素酸素検出部11aでは、被計測ガス中の水素濃度および酸素濃度に応じた信号出力が生じる。被計測ガス中の水素濃度および酸素濃度に応じた信号出力は、それぞれ、水素検出信号計測部11bおよび酸素検出信号計測部11cによって検出される。   In the hydrogen oxygen concentration measurement system 50 configured as described above, the hydrogen oxygen detector 11a introduces the atmosphere (measured gas) in the reactor containment vessel 2, while the supplied reference gas is also introduced. In the hydrogen oxygen detector 11a into which the measurement gas and the comparison gas are introduced, a signal output corresponding to the hydrogen concentration and oxygen concentration in the measurement gas is generated. Signal outputs corresponding to the hydrogen concentration and oxygen concentration in the gas to be measured are detected by the hydrogen detection signal measurement unit 11b and the oxygen detection signal measurement unit 11c, respectively.

水素検出信号計測部11bでは、水素酸素検出部11aによって検出される水素検出信号の信号レベルが計測され、計測結果が水素濃度計測手段13へ与えられる。また、酸素検出信号計測部11cでは、水素酸素検出部11aによって検出される酸素検出信号の信号レベルが計測され、計測結果が酸素濃度計測手段15へ与えられる。   In the hydrogen detection signal measuring unit 11b, the signal level of the hydrogen detection signal detected by the hydrogen oxygen detecting unit 11a is measured, and the measurement result is given to the hydrogen concentration measuring means 13. The oxygen detection signal measurement unit 11 c measures the signal level of the oxygen detection signal detected by the hydrogen oxygen detection unit 11 a and provides the measurement result to the oxygen concentration measurement unit 15.

水素濃度計測手段13では、水素検出信号の信号レベルの計測結果である水素検出信号計測部11bの出力値に対応する水素濃度が特定され、特定された水素濃度の情報が酸素濃度計測手段15と換算手段55とに与えられる。また、酸素濃度計測手段15では、水素濃度計測手段13から与えられる水素濃度の場合において最も適当な1個の被計測ガス1に含まれる酸素濃度と酸素検出信号との関係を示すデータが取得され、取得された最も適当な1個のデータにおいて、酸素検出信号の信号レベルの計測結果である酸素検出信号計測部11cの出力値に対応する酸素濃度が特定される。特定された酸素濃度の情報は、換算手段55へ与えられる。   In the hydrogen concentration measuring means 13, the hydrogen concentration corresponding to the output value of the hydrogen detection signal measuring section 11 b which is the measurement result of the signal level of the hydrogen detection signal is specified, and the information on the specified hydrogen concentration is the oxygen concentration measuring means 15. It is given to the conversion means 55. Further, the oxygen concentration measuring means 15 acquires data indicating the relationship between the oxygen concentration contained in the most suitable gas 1 to be measured and the oxygen detection signal in the case of the hydrogen concentration given from the hydrogen concentration measuring means 13. In the acquired most appropriate data, the oxygen concentration corresponding to the output value of the oxygen detection signal measuring unit 11c, which is the measurement result of the signal level of the oxygen detection signal, is specified. Information on the specified oxygen concentration is given to the conversion means 55.

換算手段55では、圧力計65から出力される原子炉格納容器2内の圧力を示す圧力情報としての信号に基づいて、水素濃度計測手段13から受け取る水素濃度の計測結果、および酸素濃度計測手段15から受け取る酸素濃度の計測結果が、原子炉格納容器2内部の全圧に対する水素濃度および酸素濃度に換算される。原子炉格納容器2内部の全圧に対する水素濃度および酸素濃度の換算結果は、記録計66、監視装置7、および発報手段56へ出力される。なお、換算手段55は、受け取る被計測ガス中の水素濃度および酸素濃度の計測結果を、記録計66等に出力する場合もある。   In the conversion means 55, the measurement result of the hydrogen concentration received from the hydrogen concentration measurement means 13 and the oxygen concentration measurement means 15 based on the signal as pressure information indicating the pressure in the reactor containment vessel 2 output from the pressure gauge 65. The measurement result of the oxygen concentration received from is converted into the hydrogen concentration and the oxygen concentration with respect to the total pressure inside the reactor containment vessel 2. The conversion results of the hydrogen concentration and the oxygen concentration with respect to the total pressure inside the reactor containment vessel 2 are output to the recorder 66, the monitoring device 7, and the reporting means 56. Note that the conversion means 55 may output the measurement results of the hydrogen concentration and oxygen concentration in the received measurement gas to the recorder 66 or the like.

一方、温度監視手段53は、防爆容器61内に配置される温度検出部62からの温度信号に基づいて、被計測ガスの温度が設定される温度に対して高いか低いかを判断し、ヒータ24による加熱が必要か否かを示す信号をヒータ制御手段54へ与える。ヒータ制御手段54は、温度監視手段53からのヒータ24による加熱が必要か否かを示す信号に基づいてヒータ24を制御する。   On the other hand, the temperature monitoring means 53 determines whether the temperature of the gas to be measured is higher or lower than the set temperature based on the temperature signal from the temperature detection unit 62 disposed in the explosion-proof container 61, and the heater A signal indicating whether or not heating by 24 is necessary is given to the heater control means 54. The heater control unit 54 controls the heater 24 based on a signal from the temperature monitoring unit 53 indicating whether heating by the heater 24 is necessary.

なお、水素酸素濃度計測システム50では、被計測ガス(水素ガスおよび酸素ガス)の温度を発火点(約570度)以上とするように設定されるほか、温度が一定となるようにヒータ24を制御するように要求することもできる。温度が一定となるようにヒータ24を制御する場合、温度によって変化する酸素検出信号の出力レベルに対する補正処理を不要にすることができる利点がある。さらに、被計測ガスの露点温度より高い設定温度で少なくとも防爆容器61内の被計測ガスを保温すれば、水素酸素検出部11aの表面が結露するのを防止することができる利点がある。   In the hydrogen oxygen concentration measuring system 50, the temperature of the gas to be measured (hydrogen gas and oxygen gas) is set to be equal to or higher than the ignition point (about 570 degrees), and the heater 24 is set so that the temperature becomes constant. It can also be requested to control. When the heater 24 is controlled so that the temperature becomes constant, there is an advantage that correction processing for the output level of the oxygen detection signal that changes depending on the temperature can be made unnecessary. Furthermore, if at least the measurement gas in the explosion-proof container 61 is kept at a set temperature higher than the dew point temperature of the measurement gas, there is an advantage that the surface of the hydrogen oxygen detector 11a can be prevented from dewing.

他方、故障検知手段57は、ヒータ24の故障を検知する機能を有しており、ヒータ24の故障検知結果を監視装置7へ与える。また、事故時起動手段58は、原子炉の事故を検知した場合に事故を検知したことを示す信号を出力する事故監視装置8からの事故検知信号を受け取ると、ヒータ制御手段54へヒータ制御動作を開始する指令を出力する。   On the other hand, the failure detection means 57 has a function of detecting a failure of the heater 24, and gives the failure detection result of the heater 24 to the monitoring device 7. When the accident start means 58 receives an accident detection signal from the accident monitoring device 8 that outputs a signal indicating that an accident has been detected when a reactor accident is detected, the heater control operation is performed to the heater control means 54. A command to start is output.

なお、上述した水素酸素濃度計測システム50は、原子炉格納容器2の内部の雰囲気を被計測ガスとする場合を説明したものであるが、原子炉格納容器2の内部に限らず、他の空間内の雰囲気中の水素濃度および酸素濃度の少なくとも一方を計測する場合に適用することができる。   Note that the hydrogen oxygen concentration measurement system 50 described above describes the case where the atmosphere inside the reactor containment vessel 2 is the gas to be measured, but is not limited to the inside of the reactor containment vessel 2 and other spaces. It can be applied when measuring at least one of the hydrogen concentration and the oxygen concentration in the inside atmosphere.

次に、本発明の実施形態に係る水素酸素濃度計測方法について説明する。
本発明の実施形態に係る水素酸素濃度計測方法は、例えば、本発明の実施形態に係る水素酸素濃度計測装置の一例である水素酸素濃度計測装置10(図1)や水素酸素濃度計測装置10を具備する水素酸素濃度計測システム50(図5)が、水素酸素濃度計測手順を実行することによって行われる。
Next, the hydrogen oxygen concentration measuring method according to the embodiment of the present invention will be described.
The hydrogen oxygen concentration measuring method according to the embodiment of the present invention includes, for example, the hydrogen oxygen concentration measuring device 10 (FIG. 1) or the hydrogen oxygen concentration measuring device 10 which is an example of the hydrogen oxygen concentration measuring device according to the embodiment of the present invention. The provided hydrogen oxygen concentration measurement system 50 (FIG. 5) performs the hydrogen oxygen concentration measurement procedure.

水素酸素濃度計測手順は、例えば、水素酸素検出部11aが行う水素および酸素検出ステップと、水素検出信号計測部11bが行う水素検出信号出力ステップと、酸素検出信号計測部11cが行う酸素検出信号出力ステップと、水素濃度計測手段13が行う水素濃度計測ステップと、酸素濃度計測手段15が行う酸素濃度計測ステップと、を具備する。   The hydrogen oxygen concentration measurement procedure includes, for example, a hydrogen and oxygen detection step performed by the hydrogen oxygen detection unit 11a, a hydrogen detection signal output step performed by the hydrogen detection signal measurement unit 11b, and an oxygen detection signal output performed by the oxygen detection signal measurement unit 11c. A hydrogen concentration measuring step performed by the hydrogen concentration measuring means 13, and an oxygen concentration measuring step performed by the oxygen concentration measuring means 15.

水素および酸素検出ステップでは、比較ガスとともに被計測ガスを水素酸素濃度計測装置10に具備される水素酸素検出ユニット11内に導入されると、水素酸素検出ユニット11の水素酸素検出部11aが、被計測ガス1に含まれる水素濃度および酸素濃度に応じた水素検出信号および酸素検出信号を得る。   In the hydrogen and oxygen detection step, when the gas to be measured is introduced into the hydrogen oxygen detection unit 11 provided in the hydrogen oxygen concentration measurement device 10 together with the comparison gas, the hydrogen oxygen detection unit 11a of the hydrogen oxygen detection unit 11 A hydrogen detection signal and an oxygen detection signal corresponding to the hydrogen concentration and oxygen concentration contained in the measurement gas 1 are obtained.

水素検出信号出力ステップでは、水素検出信号計測部11bが、水素および酸素検出ステップで得られた水素検出信号の信号レベルを計測する。また、酸素検出信号出力ステップでは、酸素検出信号計測部11cが、水素および酸素検出ステップで得られた酸素検出信号の信号レベルを計測する。   In the hydrogen detection signal output step, the hydrogen detection signal measurement unit 11b measures the signal level of the hydrogen detection signal obtained in the hydrogen and oxygen detection step. In the oxygen detection signal output step, the oxygen detection signal measurement unit 11c measures the signal level of the oxygen detection signal obtained in the hydrogen and oxygen detection step.

水素濃度計測ステップでは、水素濃度計測手段13が、水素濃度計測用データ12を参照し、水素検出信号出力ステップで得られる水素検出信号の信号レベルに対応する水素濃度を求め、求めた水素濃度を被計測ガスの水素濃度とする。   In the hydrogen concentration measurement step, the hydrogen concentration measurement means 13 refers to the hydrogen concentration measurement data 12 to obtain the hydrogen concentration corresponding to the signal level of the hydrogen detection signal obtained in the hydrogen detection signal output step, and the obtained hydrogen concentration is determined. Use the hydrogen concentration of the gas to be measured.

酸素濃度計測ステップでは、酸素濃度計測手段15が、水素濃度計測ステップで計測される被計測ガスの水素濃度と、酸素検出信号出力ステップで得られる酸素検出信号の信号レベルとを取得する一方、酸素濃度計測用データ14を参照し、水素濃度計測ステップで計測される被計測ガスの水素濃度において酸素検出信号出力ステップで得られる酸素検出信号の信号レベルに対応する酸素濃度を求め、求めた酸素濃度を被計測ガスの酸素濃度とする。   In the oxygen concentration measurement step, the oxygen concentration measurement means 15 obtains the hydrogen concentration of the gas to be measured measured in the hydrogen concentration measurement step and the signal level of the oxygen detection signal obtained in the oxygen detection signal output step. Referring to the concentration measurement data 14, the oxygen concentration corresponding to the signal level of the oxygen detection signal obtained in the oxygen detection signal output step in the hydrogen concentration of the gas to be measured measured in the hydrogen concentration measurement step is obtained, and the obtained oxygen concentration Is the oxygen concentration of the gas to be measured.

なお、上述した水素酸素濃度計測手順は、水素酸素濃度計測装置10によって行われる基本的な処理ステップを具備する場合を説明しているが、水素酸素濃度計測手順は上述したステップ以外の処理ステップを具備していても良い。例えば、水素酸素濃度計測システム50(図5)を用いて水素酸素濃度計測手順を実行する場合、水素酸素濃度計測システム50の処理手段(例えば、温度監視手段53、ヒータ制御手段54、換算手段55、発報手段56、故障検知手段57、および事故時起動手段58)が実行する何れかの処理ステップを具備していても良い。   In addition, although the hydrogen oxygen concentration measurement procedure described above describes the case where the basic processing steps performed by the hydrogen oxygen concentration measuring apparatus 10 are provided, the hydrogen oxygen concentration measurement procedure includes processing steps other than the steps described above. You may have. For example, when the hydrogen oxygen concentration measurement procedure is executed using the hydrogen oxygen concentration measurement system 50 (FIG. 5), the processing means (for example, the temperature monitoring means 53, the heater control means 54, the conversion means 55) of the hydrogen oxygen concentration measurement system 50. Any of the processing steps executed by the reporting means 56, the failure detection means 57, and the accident start means 58) may be provided.

以上、水素酸素濃度計測装置10、水素酸素濃度計測システム50、および水素酸素濃度計測装置10を用いた水素酸素濃度計測方法によれば、水素濃度を計測する計測ユニットと酸素濃度を計測する計測ユニットとを別々に備える等の異なる2個の計測ユニットを備えることなく、1個の計測ユニットを備えることによって、水素と酸素との異なる可燃性ガスの濃度を一度に検出し、その濃度を計測することができる。   As described above, according to the hydrogen oxygen concentration measuring device 10, the hydrogen oxygen concentration measuring system 50, and the hydrogen oxygen concentration measuring method using the hydrogen oxygen concentration measuring device 10, the measuring unit for measuring the hydrogen concentration and the measuring unit for measuring the oxygen concentration. Without having two different measurement units, such as separately, and by providing one measurement unit, the concentration of combustible gas different from hydrogen and oxygen is detected at one time and the concentration is measured be able to.

また、水素酸素濃度計測装置10、水素酸素濃度計測システム50、および水素酸素濃度計測装置10を用いた水素酸素濃度計測方法によれば、被計測ガスをサンプリングすることなく、酸素濃度を計測することができる。さらに、被計測ガスに水素が含まれる場合においても、被計測ガス中の酸素濃度を誤差補正した状態で計測することができる。   Further, according to the hydrogen oxygen concentration measuring device 10, the hydrogen oxygen concentration measuring system 50, and the hydrogen oxygen concentration measuring method using the hydrogen oxygen concentration measuring device 10, the oxygen concentration is measured without sampling the measurement target gas. Can do. Furthermore, even when hydrogen is contained in the gas to be measured, the oxygen concentration in the gas to be measured can be measured with the error corrected.

さらに、水素酸素濃度計測装置10、水素酸素濃度計測システム50、および水素酸素濃度計測装置10を用いた水素酸素濃度計測方法によれば、ヒータ24が設定温度に保温することで、温度に応じた補正処理が不要になる。さらに、ヒータ24が保温する設定温度を露点よりも高い温度にすることにより、水素酸素検出部11aの表面が結露するのを防止することができる。   Furthermore, according to the hydrogen oxygen concentration measuring device 10, the hydrogen oxygen concentration measuring system 50, and the hydrogen oxygen concentration measuring method using the hydrogen oxygen concentration measuring device 10, the heater 24 is kept at the set temperature, so that the temperature is adjusted. Correction processing becomes unnecessary. Further, by setting the set temperature maintained by the heater 24 to a temperature higher than the dew point, it is possible to prevent condensation on the surface of the hydrogen oxygen detector 11a.

さらにまた、水素酸素濃度計測装置10、水素酸素濃度計測システム50、および水素酸素濃度計測装置10を用いた水素酸素濃度計測方法によれば、水素酸素検出部11aを防爆容器61で覆うことにより、防爆容器61の外部の空間である原子炉格納容器2に悪影響が及ぶのを防止することができる。また、ヒータ24による加熱範囲を防爆容器61内の空間に限定することもできる。   Furthermore, according to the hydrogen oxygen concentration measuring apparatus 10, the hydrogen oxygen concentration measuring system 50, and the hydrogen oxygen concentration measuring method using the hydrogen oxygen concentration measuring apparatus 10, by covering the hydrogen oxygen detector 11 a with the explosion-proof container 61, It is possible to prevent the reactor containment vessel 2 that is the space outside the explosion-proof vessel 61 from being adversely affected. Further, the heating range by the heater 24 can be limited to the space in the explosion-proof container 61.

本発明は上記実施形態そのままに限定されるものではなく、実施段階では、上述した実施例以外にも様々な形態で実施することが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、追加、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。   The present invention is not limited to the above-described embodiment as it is, and can be carried out in various forms other than the above-described examples in the implementation stage, and various omissions can be made without departing from the gist of the invention. , Add, replace, change. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

1…被計測ガス、2…原子炉格納容器、3…原子炉建屋、4…中央制御室、5…ペネトレーション装置、6…格納容器壁、7…監視装置、8…事故監視装置、10…水素酸素濃度計測装置、11…水素酸素検出ユニット、11a…水素酸素検出部、11b…水素検出信号計測部、11c…酸素検出信号計測部、12…水素濃度計測用データ、13…水素濃度計測手段、14…酸素濃度計測用データ、15…酸素濃度計測手段、17…出力装置、21…比較ガス導入部、22…被計測ガス導入部、23…酸素イオン伝導部、24…ヒータ、25(25a,25b,25c)…電極、26…電圧計、27…電圧計測回路、28…電流計、29…電流計測回路、31a,31b…抵抗体、32…ブリッジ部、33…定電圧回路、50…水素酸素濃度計測システム、51…比較ガス供給系、52…校正ガス供給系、53…温度監視手段、54…ヒータ制御手段、55…換算手段、56…発報手段、57…故障検知手段、58…事故時起動手段、61…防爆容器、62…温度検出部、65…圧力計、66…記録計、67…警報器。   DESCRIPTION OF SYMBOLS 1 ... Gas to be measured, 2 ... Reactor containment vessel, 3 ... Reactor building, 4 ... Central control room, 5 ... Penetration device, 6 ... Containment vessel wall, 7 ... Monitoring device, 8 ... Accident monitoring device, 10 ... Hydrogen Oxygen concentration measuring device, 11 ... hydrogen oxygen detection unit, 11a ... hydrogen oxygen detection unit, 11b ... hydrogen detection signal measurement unit, 11c ... oxygen detection signal measurement unit, 12 ... hydrogen concentration measurement data, 13 ... hydrogen concentration measurement means, DESCRIPTION OF SYMBOLS 14 ... Data for oxygen concentration measurement, 15 ... Oxygen concentration measurement means, 17 ... Output device, 21 ... Comparison gas introduction part, 22 ... Gas to be measured introduction part, 23 ... Oxygen ion conduction part, 24 ... Heater, 25 (25a, 25b, 25c) ... electrode, 26 ... voltmeter, 27 ... voltage measuring circuit, 28 ... ammeter, 29 ... current measuring circuit, 31a, 31b ... resistor, 32 ... bridge part, 33 ... constant voltage circuit, 50 ... hydrogen Oxygen concentration Measuring system 51 ... Comparison gas supply system 52 ... Calibration gas supply system 53 ... Temperature monitoring means 54 ... Heater control means 55 ... Conversion means 56 ... Notification means 57 ... Fault detection means 58 ... At the time of an accident Starting means, 61 ... explosion-proof container, 62 ... temperature detector, 65 ... pressure gauge, 66 ... recording meter, 67 ... alarm.

Claims (14)

第1の電極が配設され、比較ガスが導入される比較ガス導入部と、第2の電極と第3の電極とが配設され、水素濃度および酸素濃度が計測される被計測ガスが導入される被計測ガス導入部と、前記第1の電極および前記第2の電極との間に接触した状態で介在する酸素イオン伝導部とを備え、前記第2の電極および前記第3の電極を用いて第1の電気的物理量を検出することによって、前記被計測ガスに含まれる水素を検出し、前記第1の電極および前記第2の電極を用いて第2の電気的物理量を検出することによって、前記被計測ガスに含まれる酸素を検出する水素酸素検出手段と、
予め与えられる前記第1の電気的物理量と水素濃度との関係を示すデータである水素濃度計測用データを参照し、前記水素酸素検出手段から得られる前記第1の電気的物理量の値と対応する前記水素濃度の値を前記被計測ガスの水素濃度の計測値として得る水素濃度計測手段と、
予め与えられる前記被計測ガスの異なる複数の水素濃度毎の前記第2の電気的物理量と前記被計測ガスの酸素濃度との関係を示すデータを有する酸素濃度計測用データを参照し、前記水素濃度計測手段が得る前記被計測ガスの水素濃度の前記酸素濃度計測用データにおける前記水素酸素検出手段から取得する前記第2の電気的物理量の値と対応する前記被計測ガスの酸素濃度の値を前記被計測ガスの酸素濃度の計測値として得る酸素濃度計測手段と、を具備することを特徴とする水素酸素濃度計測装置。
A first gas is provided, a reference gas introduction part into which a reference gas is introduced, a second electrode and a third electrode are provided, and a gas to be measured for measuring hydrogen concentration and oxygen concentration is introduced. A measurement gas introduction portion to be measured, and an oxygen ion conduction portion interposed between the first electrode and the second electrode in contact with each other, wherein the second electrode and the third electrode are provided Detecting hydrogen contained in the measurement gas by detecting a first electrical physical quantity using the first electrode and detecting the second electrical physical quantity using the first electrode and the second electrode. By means of hydrogen oxygen detection means for detecting oxygen contained in the gas to be measured ;
Reference is made to hydrogen concentration measurement data, which is data indicating the relationship between the first electrical physical quantity and the hydrogen concentration given in advance, and corresponds to the value of the first electrical physical quantity obtained from the hydrogen oxygen detection means. Hydrogen concentration measuring means for obtaining the value of the hydrogen concentration as a measured value of the hydrogen concentration of the gas to be measured;
Reference is made to oxygen concentration measurement data having data indicating the relationship between the second electrical physical quantity for each of a plurality of different hydrogen concentrations of the measurement gas given in advance and the oxygen concentration of the measurement gas, and the hydrogen concentration The oxygen concentration value of the measurement gas corresponding to the second electrical physical quantity value acquired from the hydrogen oxygen detection means in the oxygen concentration measurement data of the hydrogen concentration of the measurement gas obtained by the measurement means is And an oxygen concentration measuring means for obtaining a measured value of the oxygen concentration of the gas to be measured.
前記第2の電極は、前記被計測ガスに曝される面に水素ガスによる燃焼を防止するコーティング処理が未実施である一方、前記第3の電極は、前記コーティング処理が実施されており、
前記水素濃度計測手段が検出する前記第1の電気的物理量は、前記比較ガスが前記比較ガス導入部に導入されるとともに前記被計測ガスが前記被計測ガス導入部に導入される場合に、導入の前後における前記第2の電極の抵抗値の変化量を示す電気的物理量であり、
前記水素濃度計測手段が検出する前記第2の電気的物理量は、前記酸素イオン伝導部に生じる起電力を示す電気的物理量であることを特徴とする請求項1記載の水素酸素濃度計測装置。
The second electrode has not been subjected to a coating process for preventing combustion due to hydrogen gas on the surface exposed to the measurement gas, while the third electrode has been subjected to the coating process,
The first electrical physical quantity detected by the hydrogen concentration measuring means is introduced when the comparison gas is introduced into the comparison gas introduction part and the measurement gas is introduced into the measurement gas introduction part. An electrical physical quantity indicating the amount of change in the resistance value of the second electrode before and after
2. The hydrogen oxygen concentration measuring apparatus according to claim 1, wherein the second electrical physical quantity detected by the hydrogen concentration measuring means is an electrical physical quantity indicating an electromotive force generated in the oxygen ion conducting section.
前記水素酸素検出手段は、前記第1の電極と前記第2の電極との間の電圧を計測する電圧計が接続された電圧計測回路を備え、
前記第2の電気的物理量の値は、前記電圧計の指示値で与えられることを特徴とする請求項1または2記載の水素酸素濃度計測装置。
The hydrogen oxygen detection means includes a voltage measurement circuit to which a voltmeter for measuring a voltage between the first electrode and the second electrode is connected,
The hydrogen oxygen concentration measuring device according to claim 1 or 2, wherein the value of the second electrical physical quantity is given by an indication value of the voltmeter.
前記水素酸素検出手段は、抵抗値がそれぞれ既知である第1の抵抗素子および第2の抵抗素子を直列に接続したものと、抵抗値がそれぞれ既知である前記第2の電極および前記第3の電極とを直列に接続したものとを並列に接続して構成されるブリッジ部と、前記第1の抵抗素子と前記第2の電極との接点と前記第2の抵抗素子と前記第3の電極との接点との間に電圧を印加する定電圧回路と、前記1の抵抗素子と前記第2の抵抗素子との接点と前記第2の電極と前記第3の電極との接点との間を流れる電流を計測する電流計とを接続して構成される電流計測回路を備え、
前記第1の電気的物理量の値は、前記電流計の指示値で与えられることを特徴とする請求項1から3の何れか1項に記載の水素酸素濃度計測装置。
The hydrogen oxygen detection means includes a first resistance element and a second resistance element, each having a known resistance value, connected in series, and the second electrode and the third resistance value, each having a known resistance value. A bridge portion configured by connecting in parallel an electrode connected in series; a contact point between the first resistance element and the second electrode; the second resistance element; and the third electrode. A constant voltage circuit for applying a voltage between the contact point and the contact point between the first resistor element and the second resistor element, and the contact point between the second electrode and the third electrode. It has a current measurement circuit configured by connecting an ammeter that measures the flowing current,
The hydrogen oxygen concentration measuring apparatus according to any one of claims 1 to 3, wherein the value of the first electrical physical quantity is given by an instruction value of the ammeter.
前記酸素濃度計測手段は、前記水素酸素検出手段から取得される前記被計測ガスの水素濃度が、前記酸素濃度計測用データの前記異なる複数の水素濃度の何れとも合致しない場合、前記異なる複数の水素濃度の少なくとも2個の前記第2の電気的物理量と前記被計測ガスの酸素濃度との関係を示すデータを補間することによって、前記水素酸素検出手段から取得される前記被計測ガスの水素濃度の前記第2の電気的物理量と前記被計測ガスの酸素濃度との関係を示すデータを生成して取得することを特徴とする請求項1から4の何れか1項に記載の水素酸素濃度計測装置。 The oxygen concentration measuring means is configured to detect the plurality of different hydrogens when the hydrogen concentration of the measurement gas acquired from the hydrogen oxygen detecting means does not match any of the different hydrogen concentrations in the oxygen concentration measurement data. By interpolating data indicating the relationship between at least two second electrical physical quantities of the concentration and the oxygen concentration of the gas to be measured, the hydrogen concentration of the gas to be measured acquired from the hydrogen oxygen detector is obtained. 5. The hydrogen oxygen concentration measuring apparatus according to claim 1, wherein data indicating a relationship between the second electrical physical quantity and an oxygen concentration of the measurement target gas is generated and acquired. . 前記被計測ガスを加熱するヒータと、このヒータの入り切りを制御するヒータ制御手段とをさらに具備することを特徴とする請求項1から5の何れか1項に記載の水素酸素濃度計測装置。 The hydrogen oxygen concentration measuring apparatus according to any one of claims 1 to 5, further comprising a heater for heating the gas to be measured and a heater control means for controlling on / off of the heater. 前記被計測ガスの温度を検出する温度検出部から出力される温度情報が示す前記被計測ガスの温度と設定される温度とを比べ、その結果に応じた信号を前記ヒータ制御手段に出力する温度監視手段をさらに具備することを特徴とする請求項6に記載の水素酸素濃度計測装置。 The temperature at which the temperature of the gas to be measured indicated by the temperature information output from the temperature detector that detects the temperature of the gas to be measured is compared with the set temperature, and a signal corresponding to the result is output to the heater control means The hydrogen oxygen concentration measuring apparatus according to claim 6, further comprising monitoring means. 前記ヒータ制御手段は、前記被計測ガスの温度が一定に維持されるように前記ヒータの入り切りを制御するように構成されることを特徴とする請求項7に記載の水素酸素濃度計測装置。 The hydrogen oxygen concentration measuring apparatus according to claim 7, wherein the heater control unit is configured to control on / off of the heater so that a temperature of the measurement target gas is maintained constant. 前記設定される温度は、前記被計測ガスの露点温度以上の温度であり、
前記ヒータ制御手段は、前記被計測ガスの温度が前記被計測ガスの露点温度以上の温度に維持されるように前記ヒータの入り切りを制御するように構成されることを特徴とする請求項7または8に記載の水素酸素濃度計測装置。
The set temperature is a temperature equal to or higher than the dew point temperature of the measurement gas,
The heater control means is configured to control on / off of the heater so that the temperature of the measurement gas is maintained at a temperature equal to or higher than a dew point temperature of the measurement gas. 8. The hydrogen oxygen concentration measuring device according to 8.
請求項1から9の何れか1項に記載の水素酸素濃度計測装置を備えるシステムであって、
前記被計測ガスが封入される容器内の圧力を計測する圧力計から出力される圧力情報が示す前記容器内の圧力に基づいて、前記水素濃度計測手段が計測した前記被計測ガス中の水素濃度および前記酸素濃度計測手段が計測した前記被計測ガス中の酸素濃度の少なくとも一方を、前記容器内の全圧に対する濃度に換算する換算手段を具備することを特徴とする水素酸素濃度計測システム。
A system comprising the hydrogen-oxygen concentration measuring device according to any one of claims 1 to 9,
The hydrogen concentration in the measurement gas measured by the hydrogen concentration measurement means based on the pressure in the container indicated by pressure information output from a pressure gauge that measures the pressure in the container in which the measurement gas is sealed And a hydrogen oxygen concentration measurement system comprising a conversion means for converting at least one of the oxygen concentrations in the measurement gas measured by the oxygen concentration measurement means into a concentration with respect to the total pressure in the container.
前記換算手段が、換算して得る前記容器内の全圧に対する濃度が設定される範囲外にある場合に異常と判断して警報器を発報させる発報手段をさらに具備することを特徴とする請求項10記載の水素酸素濃度計測システム。 The conversion means further comprises reporting means for determining an abnormality when the concentration for the total pressure in the container obtained by conversion is out of a set range, and issuing an alarm device. The hydrogen oxygen concentration measurement system according to claim 10. 前記水素酸素検出手段は、被計測ガスが通気可能な防爆容器内に収容されて、原子炉格納容器内に配設されることを特徴とする請求項10または11記載の水素酸素濃度計測システム。 The hydrogen oxygen concentration measuring system according to claim 10 or 11, wherein the hydrogen oxygen detecting means is accommodated in an explosion proof container through which a gas to be measured can be vented and disposed in a reactor containment vessel. 請求項6から9の何れか1項に記載の水素酸素濃度計測装置を備えるシステムであって、
原子炉の事故を検知した場合に前記事故を検知したことを示す信号を出力する事故監視装置から前記事故を検知したことを示す信号を受け取ると、前記ヒータ制御手段へ前記ヒータの制御動作を開始する指令を与える事故時起動手段を具備することを特徴とする水素酸素濃度計測システム。
A system comprising the hydrogen-oxygen concentration measuring device according to any one of claims 6 to 9,
When a signal indicating that the accident has been detected is received from an accident monitoring device that outputs a signal indicating that the accident has been detected when a nuclear accident is detected, the heater control means starts the heater control operation. A hydrogen-oxygen concentration measuring system comprising an accident start means for giving a command to perform
第1の電極が配設され、比較ガスが導入される比較ガス導入部と、第2の電極と第3の電極とが配設され、水素濃度および酸素濃度が計測される被計測ガスが導入される被計測ガス導入部と、前記第1の電極および前記第2の電極との間に接触した状態で介在する酸素イオン伝導部とを備え、前記第2の電極および前記第3の電極を用いて第1の電気的物理量を検出することによって、前記被計測ガスに含まれる水素を検出し、前記第1の電極および前記第2の電極を用いて第2の電気的物理量を検出することによって、前記被計測ガスに含まれる酸素を検出する水素酸素検出手段と、予め与えられる前記第1の電気的物理量と水素濃度との関係を示すデータである水素濃度計測用データを参照し、前記水素酸素検出手段から得られる前記第1の電気的物理量の値と対応する前記水素濃度の値を前記被計測ガスの水素濃度の計測値として得る水素濃度計測手段と、予め与えられる前記被計測ガスの異なる複数の水素濃度毎の前記第2の電気的物理量と前記被計測ガスの酸素濃度との関係を示すデータを有する酸素濃度計測用データを参照し、前記水素濃度計測手段が得る前記被計測ガスの水素濃度の前記酸素濃度計測用データにおける前記水素酸素検出手段から取得する前記第2の電気的物理量の値と対応する前記被計測ガスの酸素濃度の値を前記被計測ガスの酸素濃度の計測値として得る酸素濃度計測手段とを具備する装置を用いて行う水素酸素濃度計測方法であり、
前記水素酸素検出手段が、前記比較ガスが前記比較ガス導入部に導入されるとともに前記被計測ガスが前記被計測ガス導入部に導入される場合に前記第1の電気的物理量と前記第2の電気的物理量とを検出するステップと、
前記水素濃度計測手段が、前記水素濃度計測用データを参照し、前記水素酸素検出手段から得られる前記第1の電気的物理量の値と対応する前記水素濃度の値を前記被計測ガスの水素濃度の計測値として得るステップと、
前記酸素濃度計測手段が、前記酸素濃度計測用データを参照し、前記水素濃度計測手段が得る前記被計測ガスの水素濃度の前記酸素濃度計測用データにおける前記水素酸素検出手段から取得する前記第2の電気的物理量の値と対応する前記被計測ガスの酸素濃度の値を前記被計測ガスの酸素濃度の計測値として得るステップと、を備えることを特徴とする水素酸素濃度計測方法。
A first gas is provided, a reference gas introduction part into which a reference gas is introduced, a second electrode and a third electrode are provided, and a gas to be measured for measuring hydrogen concentration and oxygen concentration is introduced. A measurement gas introduction portion to be measured, and an oxygen ion conduction portion interposed between the first electrode and the second electrode in contact with each other, wherein the second electrode and the third electrode are provided Detecting hydrogen contained in the measurement gas by detecting a first electrical physical quantity using the first electrode and detecting the second electrical physical quantity using the first electrode and the second electrode. By referring to hydrogen concentration measurement data which is data indicating the relationship between the hydrogen electrical concentration detection means for detecting oxygen contained in the gas to be measured and the first electrical physical quantity given in advance and the hydrogen concentration, The first obtained from the hydrogen oxygen detection means A hydrogen concentration measuring means for obtaining a value of the hydrogen concentration corresponding to the value of the electrical physical quantity of the gas as a measured value of the hydrogen concentration of the gas to be measured; 2 for measuring the oxygen concentration of the hydrogen concentration of the measurement gas obtained by the hydrogen concentration measurement means with reference to oxygen concentration measurement data having data indicating the relationship between the electric physical quantity of 2 and the oxygen concentration of the measurement gas Oxygen concentration measuring means for obtaining, as a measured value of the oxygen concentration of the measurement target gas, a value of the oxygen concentration of the measurement target gas corresponding to the value of the second electrical physical quantity acquired from the hydrogen oxygen detection means in the data It is a method for measuring hydrogen oxygen concentration performed using an apparatus comprising:
The hydrogen oxygen detection means detects the first electrical physical quantity and the second electric quantity when the reference gas is introduced into the comparison gas introduction unit and the measurement gas is introduced into the measurement gas introduction unit. Detecting an electrical physical quantity;
The hydrogen concentration measurement means refers to the hydrogen concentration measurement data, and determines the hydrogen concentration value corresponding to the first electrical physical quantity value obtained from the hydrogen oxygen detection means as the hydrogen concentration of the gas to be measured. Obtaining as a measurement value of
The oxygen concentration measurement means refers to the oxygen concentration measurement data, and acquires the hydrogen concentration of the measurement target gas obtained by the hydrogen concentration measurement means from the hydrogen oxygen detection means in the oxygen concentration measurement data. And a step of obtaining a value of oxygen concentration of the measurement target gas corresponding to the value of the electrical physical quantity as a measurement value of oxygen concentration of the measurement target gas.
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