Maximizing condensate return is a powerful cost reduction tool. Chemical dispersants are often used to minimize deposition of iron and other contaminants, but do nothing to address root causes which often reside in the condensate system. As boiler cycles increase, contaminants - mostly iron and copper returned with the condensate - remain in the boiler for longer periods of time, increasing the likelihood of deposition.
When boiler cycles are low, feedwater contaminants are removed from the boiler through the blowdown before they deposit on heat transfer surfaces. Improvements in pretreatment technology, most notably in reverse osmosis, have provided the means, but new concerns have arisen as a result.
Driven by financial necessity, operators of steam boiler systems have sought ways to increase boiler cycles of concentration to reduce energy and water losses through boiler blowdown.
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