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Monitoring and Simulated Experiments of Oxidation-Reduction Potential of Boiler Feedwater at High Temperatures |
Yue QIAO, Zhiping ZHU(), Lei YANG, Zhifeng LIU |
Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410004, China |
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Abstract Oxidation reduction potential (ORP) measurement can be an effective means for maintaining the state of feedwater for power station to be oxidizing, neutral, or reducing. In order to investigate the characteristics of ORP and its correlation with metal corrosion in high temperature water, a series of experiments including electrochemical measurement and simulated corrosion experiment were carried out. The results show that the ORP increases with the increase of dissolved oxygen content, while decreases with the increase of pH and temperature. Besides the flow rate has no effect on the ORP. It follows that ORP measurements for high-temperature and -pressure waters, as compared to the ones for low-temperature ORP waters, can act as a more sensitive and accurate method to effectively detect the trace amount of dissolved oxygen. In summary, ORP measurements can be used to understand, monitor and control the corrosion of steels in feedwater.
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Received: 27 September 2017
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Fund: Supported by Key Project of Hunan Science and Technology Plan (2013GK2016) and Hunan Postgraduate Research and Innovation Project (CX2017B488) |
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