Control systems Desuperheaters
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TI-P475-06 CTLS Issue 4
Desuperheater Online Program Sizing Guidance
Description In typical process plants, process steam is usually superheated, or heated to a temperature above saturation. The difference between the saturation temperature and the actual temperature of the steam is called 'superheat'. Desuperheated steam is more efficient in the transfer of thermal energy, consequently desuperheaters are used to bring the outlet degree of superheat closer to that of saturation. Desuperheaters reduce the temperature of superheated process steam by introducing finely atomized cooling water droplets into the steam flow. As the droplets evaporate, sensible heat from the superheated steam is converted into latent heat of vaporization. A typical desuperheater installation is shown below:
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Combined pressure reducing/desuperheating station for venturi and spray type desuperheaters
Pressure controller
Steam supply
Desuperheater
Pressure regulating control valve
Check valve
Cooling water
Temperature controller
Temperature regulating control valve
TI-P475-06 CTLS Issue 4
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Desuperheater Online Program Sizing Guidance
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