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Knowing the sources behind degradation of gas turbine power and heat rate and the performance of other power plant equipment are critical to equipment manufacturers for guaranteeing their respective performances over the life cycle as well as to utility/plant owners for cost reasons. Many power companies are trying to improve equipment reliability by focusing on Performance Monitoring and the application of advanced diagnostic technologies. The first part of the paper describes a method to monitor gas turbine compressor efficiency, forecast an efficiency decay rate in terms of operating hours, introduce the logic leading to an optimum schedule pertaining on-line/off-line water washing, correct measured real-time gas turbine power and heat rate with respect to the new and clean reference point, and then deduce the respective turbine and compressor power contributions to gas turbine net power degradation. An example is used to aid the planning of a rigorous but effective schedule in compressor washing. The second part focuses on assessing degradation at the plant level (simple or combined cycle). The derived gas turbine degradation methodology is integrated with the overall plant performance degradation, and as a result, the maintenance effectiveness of the most recent outage can be measured. The proposed methodology is applied to a hypothetical combined cycle plant, allowing the identification of possible sources of plant deterioration with recommendations for corrective actions to improve overall power and heat rate.Copyright © 2008 by ASME |
