Dewatering parameters in a screw press and their influence on the screw press outputs


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El idrissi, B., Loranger, É, Lanouette, R., Bousquet, J. P. et Martinez, M. (2019). Dewatering parameters in a screw press and their influence on the screw press outputs. Chemical Engineering Research and Design, 152 . pp. 300-308. ISSN 0263-8762 DOI 10.1016/j.cherd.2019.10.001

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A Thune SP23 screw press dewatering parameters were studied. The dewatering efficiency was affected more by the rotational speed and the pulp properties. The counter-pressure affects dewatering near the discharge end, and it was observed to influence the outlet consistency and filtrate flow rate of Kraft, which has much longer fibres and fewer fines compared to TMP and BCTMP. The feed stock freeness and consistency are very important variables to consider in the screw press performance. The freeness reflects the degree of drainage, which is an important parameter to consider when optimising the screw press, while the feed consistency is a parameter of the fibre-fibre contact degree. The pulp properties, especially the fines content and fibre flexibility are also two very important parameters that affect the screw press performance. This study was to provide an insight of the screw press performance and to show the complex effect of the operational parameters on the dewatering characteristics. Using three different pulps, Kraft and TMP softwood fibres and a BCTMP hardwood fibres, we have shown that the fines content and fibre properties are two dominant properties that should be highly considered when operating a screw press. © 2019 Institution of Chemical Engineers

Type de document: Article
Mots-clés libres: dewatering screw press water removal wood pulp fibers hardwoods pulp materials screws thermomechanical pulping process counter pressure ee-watering efficiencies fibre properties operational parameters rotational speed presses (machine tools) consistency parameters pressure
Date de dépôt: 01 juill. 2021 16:21
Dernière modification: 01 juill. 2021 16:21
Version du document déposé: Post-print (version corrigée et acceptée)

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