Atomizing Desuperheater units employ one or more special spray nozzles to atomize the water droplets and produce the heat transfer contact area necessary for cooling the steam and evaporating the droplets. Initial applications were for periodic usage on emergency dump-to-condenser systems in power stations where precise desuperheating was not necessary and excess water flows were common. Atomizing Desuperheater units are also used on controlled over-pressure dump and bypass systems.
Approach point as low as 6oC over saturation is possible.
Advantages
- High turndown ration up to 50:1
- Designed for economically desuperheating high steam flows in large steam lines
- No moving parts
- Negligible pressure drop
Disadvantages
- Atomizing steam required
- Additional expenses due to pipework and control
Applications
- Turbine bypass steam temperature control