Once-through boilers require a minimum evaporator flow to cool the boiler tubes during start-up (minimum evaporator flow for spiral wound evaporators is approximately 30%).
A recirculation system recirculates water out of the water separator back into the feedwater tank or to the economiser/evaporator to ensure the minimum evaporator flow. Different layouts of the recirculation system exist, recirculation of the water from the separator back to the feed water tank and water recirculation from the separator back to the economiser inlet with a recirculation pump. In addition to the above operating modes the start-up valves can be used during boiler-filling and evaporator (air) purging.
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