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The objective of this research is to analyze impact of fouling on gas turbine’s compressor which is significant loss of efficiency in gas turbine. As the loss from fouling, compressor’s efficiency can be recovered by off line compressor washing and optimization of washing schedule for minimizing cost should be considered. The intake air filtration is upgraded to reduce compressor degradation and extend washing period. This research studies data of gas turbine in combine cycle power plant. The independent variables are collected for analyzing of compressor and thermal efficiency before and after upgrading for 1 year. The results shown that before upgrading intake air filtration system, compressor degradation is 0.757 % per1,000 hours with optimization of washing schedule 6 times per year. After upgrading, compressor degradation is 0.229 % per 1,000 hours with optimization of washing schedule 3 times/year. Moreover, the economic results revealed that improved air intake filtration can reduce the cost of 12 million THB per year and payback period is approximately 11 months.
Keywords: off line compressor washing; compressor degradation; intake air filtration system; gas turbine’s compressor; fouling
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