Saturated Steam And Superheated Steam

- Jan 15, 2018 -

Saturated steam and superheated steam

steam boiler

According to the steam characteristics, steam boilers can be divided into saturated steam boiler and superheated steam boiler. In the boiler, the energy from the fuel is diverted to liquid water to produce steam. At first, cold water warms up and receives energy in the form of "sensible heat" up to its boiling point.

Once the boiling point is reached, the temperature of the water stops rising and remains unchanged until all the water has evaporated. Water changes from a liquid state to a vapor state and receives energy in the form of "latent heat of vaporization." As long as there is still some liquid water, the temperature of the steam is the same as the liquid water. Steam is called saturated steam. When all water evaporates, the subsequent heating raises the temperature of the steam. Steam above the saturated steam level is called superheated steam.

In contrast to superheated steam, saturated steam is balanced with heated water at the same pressure, that is, it is not heated to the boiling point. If saturated steam decreases its temperature (while maintaining its pressure), it will condense to produce water droplets, even above 100 ° C boiling point at standard pressure. These condensate droplets are responsible for damage to the turbine blades, which is why such turbines rely on dry, superheated steam supplies.

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