“Impurities in Turbine : Deposition, Liquid Film Formation and Condensation”

This blog discusses about the formation of different kinds of deposition during turbine functioning and the relevant damage mechanisms that operate.  Even though the functioning of Turbine involves complex stages and use of exotic materials , but with the advances in the technology and research on turbine damage mechanisms the composition of the inlet steam can be determined. It is very important to evaluate the inlet composition of the steam and the composition of the droplets that form on the internal surface of the turbine. One of the main parameter that determines the energy losses is the condensate particle size . As a rule of thumb , the larger the droplet size the larger the frictional energy loss. The pure steam accompanying the moisture is also very detrimental to turbine functioning, as it decreases the efficiency thermo-dynamically  and can lead to corrosion /erosion of the blades. So its very important to study the phenomenon of moisture film formation and the associated nucleation process.

steam-turbine-bucket-foreign-object-damage-field

The nucleation seeds on the turbine surfaces can be provided multiple impurities. The oxide impurities and dry-wet transition of the steam can always provide initiation of the droplets. A very small size of the impurities on the scale of the angstrom can be very dangerous to the steam path surface. As they can eventually assist in the liquid film formation on the surface oxides.

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