Design and Operation of a Sampling and Analysis System to Meet the Needs of On-Line Monitoring of Cycle Chemistry in Modern Power Plants

摘要

The face of sampling and on-line monitoring has changed considerably since the 1970s. Initially the power plant was overpopulated with on-line analysers for the monitoring of the cycle chemistry. As the power industry began to economise, especially with respect to the labour force, many of these analysers fell into disuse and today only the minimum equipment is in-stalled. However, standards and specifications with respect to the sampling and on-line monitoring of chemical variables have been compiled and are of great assistance to the end user in the selection of equipment. Additional criteria for selection include: ease of operation; reliability; minimum maintenance; This presentation explores the dilemma of maintaining steam purity specifications whilst taking into account the economic operation of the plant versus the financial implications of poor cycle chemistry monitoring. The value of quality assurance and control as well as data logging and on-line diagnostics is also presented.