Power Consumption and Fibre Development in a TMP Refiner Plate Gap-Comparison of Unidirectional and Standard Refiner Segment, 2007 International Mechanical Pulping Conference

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The aim of this study was to get new information about the power consumption of thermomechanical pulp refining and about the mechanisms of the refining. Power consumption distribution and fibre development in a TMP refiner plate gap was studied using data from mill test trials conducted using the LE segments and the standard segments in a refiner. The effects of these different types of segments on refining were compared.

The power consumption distribution curve was calculated based on mass and energy balances and by using the temperature and consistency profiles of the refiner. Temperature and consistency profiles were determined in connection with the test trials. The calculation was based on the assumption that there is no steam flow over the point of the maximum temperature. The feed consistencies were not known and the calculation was done using the feed consistencies that gave total power consumptions roughly the magnitude of the actual motor powers.