INSTRUMENTS MONITORING POWER STEAM

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Abstract

Electric Power Research Institute (EPRI) guidelines specify the regular monitoring of several ions in the cycle chemistry of steam-based power generation plants in order to minimize corrosion and scaling of boiler and turbine components, thereby lengthening their lifecycle and averting unscheduled shutdowns of the generating unit. On-line monitoring systems are available for some of these ions (e.g., pH [i.e., H+] and sodium), but not for others such as chloride and sulfate. Because on-line systems have not been readily available for chloride and sulfate, EPRI recommends the use of cation conductivity as the means to monitor for cycle contamination. However, this is an indirect measureﾗ should the cation conductivity increase unexpectedly, contamination is inferred, but the increased conductivity could arise from other conditions as well. A routine, on-line monitoring system for chloride and sulfate is desirable in order to provide immediate and direct indication of any contamination in the steam cycle water.

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