Desuperheater with accurate control
September 2013
Valves, Actuators & Pump Control
PSV Mitech’s locally designed eSteam desuperheater is a low maintenance, low cost solution for cooling superheated steam to within a few degrees of setpoint. By simply changing the size of nozzle, the standard unit covers a wide range of requirements. It is designed for steam with flow rates up to 100 t/h at temperatures up to 500°C and pressures to 40 bar(g). A water turndown of 20:1 is achieved by varying the number of nozzles in use and the proportion of the sample time that one of these is open. Typically, downstream steam temperature is cooled to within 2 to 5°C of the saturation temperature.
The eSteam desuperheater can be used with water up to 12 t/h with a water injection temperature up to 140°C at 20 to 40 bar(g) pressure. The nozzles are sized according to the required water flow rate needed for the given steam parameters. No additional control valves, steam assist or instrument air is required – only water, power and the position signal. The device, which may also be used as an attemperator, offers a high turndown and good controllability with no moving parts in the steam flow.
The custom designed microprocessor controller not only allows for smooth transitions across the turndown range, but also monitors the number of cycles completed by each solenoid and spreads the load across all five, thereby increasing the overall lifespan of the unit.
System components include nozzles, sparger, solenoid valves, manifold and controller enclosure. Temperature feedback is via the control room in the form of a 4 – 20 mA position signal to the desuperheater.
For more information contact Greg Walker, PSV Mitech, +27 (0)11 657 6000, [email protected], www.mitech.co.za
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