What happens when wet steam flows through a throttle valve?

What happens when wet steam flows through a throttle valve?

Throttling of wet steam usually causes an increase in vapor quality, entropy, and temperature decrease.

What is the difference between dry saturated steam and superheated steam?

Pressure-Temperature Relationship of Water & Steam Saturated (dry) steam results when water is heated to the boiling point (sensible heating) and then vaporized with additional heat (latent heating). If this steam is then further heated above the saturation point, it becomes superheated steam (sensible heating).

Why is steam superheated?

When saturated steam produced in a boiler is exposed to a surface with a higher temperature, its temperature will increase above the boiling temperature. The steam is then described as superheated by the number of degrees through which it has been heated above saturation temperature.

When steam is superheated how many properties are required to calculate its state?

If the steam exists in only one phase (superheated steam), it is necessary to specify two independent variables, pressure and temperature, for the complete specification of the state.

What is throttling of steam?

A part of steam would be tapped out from the steam pipe at constant pressure and throttled. During throttling, the quality of the steam (dryness fraction)increases and at a point the wet steam would be converted to dry saturated steam.

What is the degree of superheat after steam throttling?

For supply steam below 30 bar g in the dry saturated state, any drop in pressure will produce superheated steam after throttling. The degree of superheat will depend on the amount of pressure reduction.

What is the use of steam throttling?

The steam throttling is largely used in the throttling calorimeter , where the dryness fraction of the wet steam could be determined. A part of steam would be tapped out from the steam pipe at constant pressure and throttled.

What is the difference between superheated steam and wet steam?

At any point above the saturation curve the steam is superheated, and at any point below the saturation curve the steam is wet. The saturation curve itself represents the condition of dry saturated steam at various pressures.

What happens when steam is more than 100\% dry?

When steam is more than 100\% dry it is called superheated steam. This type of steam is created by adding heat above the saturated steam threshold. The added heat raises the steam’s temperature higher than its saturation point, allowing the amount of superheat to be easily determined by simply measuring its temperature.