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Pitting due to all kinds of impurities (clinkers) in the coal that couldn't be cleaned. This is the major problem with coal-fired turbines and cylinder (like internal combustion--not steam) engines, the clinkers are abhorrently abrasive and pit the turbine blades and cylinder heads. <br />One wonders what a high-speed centrifugal filter inserted before the turbine blades or cylinder heads might accomplish. I would think it could successfully spin out any clinkers of appreciable size. What was left shouldn't be so damaging. But, what do I know?
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