If the reject rate is too low, the cleaning efficiency will be unacceptably low. The reject rate is an important parameter for determining cleaning efficiency. Excessively low volumetric rejects can lead to plugging and insufficient contaminant removal, while excessively high volumetric rejects can lead to turbulence and overwhelm the lower stages with fiber. The pressure differential (dp), the difference in pressure between the accept and reject headers, determines the volumetric reject rate, which can impact removal efficiency and runnability. Generally, hydrocyclones operated at a high Pressure Drop have a better cleaning efficiency than those operated with a lower Pressure Drop however, excessively high Pressure Drops will result in a drop off in efficiency, as the effect of decreased residence time becomes greater than the effect of the increase in centrifugal force. An increase in pressure drop can impact hydrocyclone efficiency because it:Д¬onsequently, the Pressure Drop depends upon the type of cleaner used in an application. Operating pressuresДЄ Pressure Drop, the drop in pressure between the feed and accept headers, determines the cleaner flow capacity, and can impact removal efficiency. Chris Koterba, Product Manager, Hydrocyclones, North America, a presenter at a recent Valmet webinar, provided insight into five such factors: 1. When working with mill personnel to optimize hydrocyclone performance, Valmet cleaner experts often turn to common factors that impact cleaner control and operating parameters. As a result, there are many variables that can impact the runnability of a pulp cleaner system. These systems can be put into practice in many different arrangements based upon the goals and layout of the mill application. Hydrocyclone systems remove unwanted particles such as sand, glass, metal, plastic and polystyrene from pulp.

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