When water is heated at atmospheric pressure, 100 ℃ is the highest allowable temperature for liquid water under this pressure. Reheating can not increase the temperature of the water, but can only convert water into steam. The heat absorbed by water in the process of heating up to the boiling point is called sensible heat, or sensible heat of saturated water.
The heat required to convert saturated water into steam at the same atmospheric pressure is called latent heat. However, if the water is heated at a certain pressure, the boiling point of the water will be higher than 100 ℃, so more sensible heat is required. The higher the pressure, the higher the boiling point of water, and the higher the heat content.
When the pressure decreases and some sensible heat is released, this excess heat will be absorbed in the form of latent heat, causing some water to be “flash” into steam, which is the working principle of the flash column.
Flash occurs in a pipeline system, which is easy to cause cavitation damage to the valve. Anti-cavitation high-pressure valve can be selected, which is characterized by multiple throttling and pressure sharing, and also can be used with anti-cavitation erosion materials.