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Model and optimal operational windows for hydrodynamic fiber fractionation
Nordic Pulp & Paper Research Journal ( IF 1.2 ) Pub Date : 2021-03-01 , DOI: 10.1515/npprj-2020-0059
Thomas Schmid 1 , Stefan Radl 1
Affiliation  

Based on fitted experimental data, an empirical fractionation model for mini-channel hydrodynamic fiber fractionation (miniFrac) is presented. This model, combined with an optimization procedure, is then used as a design tool to synergize competing fractionation performance characteristics, i. e., product quality, product yield and energy demand. Based on this model, miniFrac is compared to state-of-the-art fiber fractionation technology with respect to (i) long fiber-short fiber fractionation and (ii) fines-fiber fractionation. In terms of fines-fiber fractionation, miniFrac is outperformed by typical micro-hole pressure screening regarding the purity of fines fraction. However, a comparison with a slotted (slot width of 0.2 mm) and a smooth-holed pressure screen (hole diameter of 0.8 mm) shows, that miniFrac is capable of outperforming both systems regarding product quality and energy demand at a comparable product yield. If, in the case of fines-fiber fractionation, reject purity (i. e., fines exclusion) is more important than fines purity (i. e., long fiber remain in the reject), miniFrac is an interesting tool with some key advantages over pressure screens.

中文翻译:

流体动力纤维分馏的模型和最佳操作窗口

基于拟合的实验数据,提出了一种用于微通道水动力纤维分馏的经验分馏模型(miniFrac)。然后,将该模型与优化程序结合起来,用作协同竞争分馏性能特征的设计工具。例如,产品质量,产品产量和能源需求。在此模型的基础上,就(i)长纤维-短纤维分馏和(ii)细纤维分馏,将miniFrac与最新的纤维分馏技术进行了比较。在细纤维分级方面,就细粒级分的纯度而言,miniFrac的性能优于典型的微孔压力筛选。但是,与开槽(缝隙宽度为0.2 mm)和平滑筛孔的压力筛(孔直径为0.8 mm)的比较显示,miniFrac能够以可观的产品产量在产品质量和能源需求方面均优于两个系统。如果在细纤维分级的情况下,废品纯度(即排除细粉)比细度纯度(即长纤维留在废品中)更为重要,那么miniFrac是一种有趣的工具,与压力筛相比具有一些关键优势。
更新日期:2021-03-17
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