Low maintenance desuperheater
December 2013
Valves, Actuators & Pump Control
PSV Mitech’s locally designed and manufactured eSteam desuperheater has a high turndown and good controllability with no moving parts in the steam flow. No additional control valves, steam assist or instrument air are required – only water, power and position signal. The eSteam desuperheater is a low-maintenance and low-cost solution for cooling superheated steam to within a few degrees of setpoint. It is designed for steam with flow rates up to100 t/h at temperatures up to 500°C and pressures to 40 bar(g).
With five nozzles, the standard unit can cover a wide range of requirements, while the larger models have seven nozzles. Fine temperature control of ±1°C is achieved by controlled pulsing of the solenoid valves, each of which feeds high pressure water to a spray nozzle. This is the primary advantage of this system – the full available water pressure is applied across the nozzles when they are operating.
The eSteam desuperheater can be used with water up to 12 t/h with up to 140°C water injection temperature at 20 to 40 bar(g) pressure. The nozzles are sized according to the required flow rate needed for the given steam parameters.
PSV Mitech’s custom designed microprocessor controller not only allows for smooth transitions across the turndown range, but monitors the number of cycles completed by each solenoid and spreads the load across all five, thereby increasing the overall lifespan of the unit.
For more information contact Greg Walker, PSV Mitech, +27 (0)11 657 6000, [email protected], www.mitech.co.za
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