Earlier Brian H wrote:

First, and foremost, removing any entrained water droplets from the steam, no matter how small. Your steam needs to be 100% water vapor(well at least 99%), with no entrained droplets. Conventional steam plants accomplish this by means of superheat. Superheating (heating above saturation temperature) ensures that no "carryover" of water droplets makes it's way into the turbine. The main reason for this is the extreme velocity that steam leaves the nozzles. Any entrained water droplets will act just like tiny bits of sand at that high velocity, and will impinge on your vanes, and quickly erode your turbine wheel, no matter what it's made of.

I think that Brian H is right. Is there any way to overcome this difficulty (to make the wheel to stand without excessive costs)? There have been some developments of such kind of 'semiturbines', which would partly accept water in the turbine, but I don't know about their success.