Structural Material Anomaly Detection SystemUsing Water Chemistry Data, (VII). Diagnosing Causes of Small Changes in Water Chemistryby Analyzing On-Line Conductivity and pH Data.:Diagnosing Causes of Small Changes in Water Chemistry by Analyzing On-Line C
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概要
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A method to detect small changes in water quality and diagnose their causes by analyzing on-line conductivity and pH data was proposed. Laboratory tests showed that effective noise reduction of measured on-line data could be got by using a median filter to detect small changes of conductivity; a relative change of 0.001μpS/cm was distinguishable. By simulating the changes of pH and conductivity in the reactor water against a small concentration change of sodium ion or sulfate ion in the feedwater, it was found that an adequate elapsed time for the diagnosis was 4 h from the start of the concentration change. A conductivity difference of 0.001μS/cm in the reactor water made it theoretically possible to distinguish between a sodium ion concentration change of 4.6 ppt and a sulfate ion concentration change of 9.6 ppt in the feedwater.
著者
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Uchida Shunsuke
Energy Research Laboratory Hitachi Ltd.
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Ohsumi Katsumi
Hitachi Works Hitachi Ltd.
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ASAKURA Yamato
Hitachi Works, Hitachi Ltd.
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NAGASE Makoto
Energy Research Laboratory, Hitachi Ltd.
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OHSUMI Katsumi
Hitachi Works, Hitachi Ltd.
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UCHIDA Shunsuke
Energy Research Laboratory, Hitachi Ltd.
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