Steam atomising desuperheater
August 2001
Valves, Actuators & Pump Control
In some applications it is required to reduce the temperature of superheated steam. This is achieved by adding vaporised water to the steam where the small droplets will absorb energy so the temperature will drop.
A steam atomising desuperheater is used to achieve this. The unit consists of external water and steam inlets, each leading to a nozzle or a set of nozzles, depending on the requirements. The steam flows through the internal venturi-shaped nozzle drawing in the low temperature and pressure water. The water mixes with the steam, is atomised in the process and carried into the main steam line. This results in an increased flow of steam at a lower temperature. Adjusting the water flow by means of a spray water control valve can thus control the temperature of the steam.
The advantages of the steam atomising desuperheater includes:
* Good atomisation across a wide range of flows.
* Uses low-pressure water.
* Good turndown ratio.
* Compact in design.
* Low-pressure drop in main steam line.
The best applications are for units where only low-pressure water is available.
Mitech
(011) 462 2160
[email protected]
www.mitech.co.za
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