Scaling on turbine blades
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Are turbine blades more prone to scaling under wet steam conditions or less prone to scaling? Why
It’s more prone to scaling; I think so
In actual production, scaling occurs mainly in the high and medium pressure stages; scaling is less likely to occur in the wet steam area. I guess this is because salts in the wet steam do not easily precipitate, and the flow velocity there is also relatively high. In fact, one method for cleaning scale from blades is to use wet steam cleaning.
Dry steam is probably more prone to scaling, right? Moist steam generates water, which creates shock waves that help remove some of the dirt. I’m guessing; I’ll check it out and let you know later
I checked, and it seems that wet steam makes the structure easier. Superheated steam contains trace amounts of oxygen, which causes oxidative corrosion at high temperatures and the formation of salts that can damage the blades. In the wet steam area, scale absorbs water droplets to form an electrolyte, leading to chemical corrosion. Moreover, wet steam can easily cause water hammer, reducing the efficiency of the unit and eroding the blades. So dry steam is better. :P