Abstract
Mechanical-drive steam turbines have the heavy deposition of fouling materials on blade and nozzle path surfaces due to contamination. As a result, turbine performance tends to be deteriorated gradually. The first paper introduced this fouling phenomena and actual conventional washing procedure in order to prevent the fouling problem and its practical disadvantage. In this second report, regarding new washing method to resolve above disadvantage, the results of detail analysis for erosion damage, thermal stress evaluation of internal parts due to injected water and heat balance of steam/water mixture are introduced in comparing online washing test results.
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