 Application: Attemperator/Desuperheater system supplying
steam to high pressure and low pressure turbines.
Where In Process?: The Kates is used to control the flow of condensate water to spray nozzles which cool steam in the attemperator from 1000º F down to 625º F, which is used to lubricate low pressure turbine seals. The system uses timed solenoids activated by a temperature switch together with a constant flow from the Kates Controller to ensure the proper volume of condensate.
Why Flow Rate is Critical?: To control temperature drop accurately. Excessive flow will drop the temperature below 625º degrees, requiring additional energy to reheat the steam. Inadequate flow will leave the steam too hot, causing seal damage on the low pressure.
What Alternatives Were Considered: Back pressure regulator with an orifice plate downstream.
Main Reasons for Choosing Kates: Supply pressure can vary from 250 to 375 PSIG to the spray nozzles. Kates compensates for varying pressures to accurately control flow.
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