Question

What is the material used for building turbines in geothermal plant?

(a) Chrome steel

(b) Bronze alloys

(c) Cast iron

(d) Copper alloys

This question was posed to me in class test.

The doubt is from Problems Associated with Geothermal Conversion topic in chapter Ocean Energy & Geothermal Energy of Energy Engineering

Answer 1

Right choice is (a) Chrome steel

For explanation I would say: In the turbine, steam nozzles and blades are subjected to dry or high quality steam is usually made of 11 to 13 percent chrome steel. The nozzles are usually designed with large throat areas o a wide pitch to minimize scaling.