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What is the maximum moisture content in a steam turbine exhaust?

What is the maximum moisture content in a steam turbine exhaust? Correct Answer 15%

Explanation:

  • From the consideration of the erosion of blades in the later stages of a turbine, the maximum moisture content at the turbine exhaust is not allowed to exceed 15 %, or the quality of steam to fall below 85 %.
  • Most of the turbine expansion should take place in the single-phase or vapor region.

Additional Information

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As seen from the diagram when temperature increase from 1 – 1’ then quality of steam increases from 2 – 2’.

Efficiency and Rankine cycle increases with increasing effective mean temperature and heat addition.

Effective mean temperature of heat addition increases by

(a)  High dryness fraction

(b)  High temperature of heat addition

(c)  High pressure of heat addition

Note: This is the advantage of reheating cycle.

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