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A major problem in geothermal power plants, where the silica dust comes up along with the steam. Very corrosive by sand blasting. A cyclone is one trick to separate dust and vapour.

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13y ago

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What are the reasons of Erosion and deposits in steam turbine?

The steam. Steam passing through a turbine spinning at a speed of 3600rpm will have a tip velocity on it largest wheel of about 1800 feet per second. In order to reach that speed the steam must be moving at least that fast through the blades. that is about 1200 miles per hour, or more than 1 1/2 times the speed of sound. The steam also over time picks up impurities from the steam pipe to the turbine, these will cause erosion similar to sand blasting. The water in the boiler has impurities that can't be removed effectively, one is silica. At high temperature in the boiler the silica vaporizes into the steam passages, as it passes through the turbine the steam cools and the silica solidifies again into deposits on the turbine blades. There are other causes but these are the most common.


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Silica is usually measured for 2 reasons, if Silica is carried over into the steam from the boiler, it can deposit on the blades causing pitting and eventually either efficiency losses or catastrophic failure of the blades, secondly it is measured after the condenser, this is to check for condenser tube leaks, because if the river water breaks through then the silica levels will shoot up. Hope it helped. Reference: (Work at an e.on-uk powerplant)


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