Comparing fibre length fractionation of a laboratory flow channel to an industrial pressure screen

机译：比较实验室流道的纤维长度分馏率与工业压力筛

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Fibre length fractionation of Pinus Radiata kraft pulp through 1mm smooth holes in a laboratory flow channel and in an industrial pressure screen of narrow length is reported. Screening results are compared to determine whether the flow channel can be used to predict fractionation behaviour of industrial pressure screens. Two pressure screen rotors were used, namely a step and a bump rotor. The pressure screen gave overall fibre passage ratio values higher than the flow channel for both rotors at similar aperture velocities and upstream flow conditions. Passage ratios of the individual length fractions were also higher for most fibre fractions. The difference is attributed to the dynamic nature of the flow field caused by the pressure pulse from the screen rotor. The pressure pulse induces both forward and reverse flow and the overall fibre passage ratio is the combined affect of both flows. Length fractionation efficiencies, as measured by the separation ratio a, were different for each case. The step rotor gave the highest efficiency followed by the flow channel, followed by the bump rotor. All experienced decreasing fractionation efficiency with increasing normalised velocity (V_s/V_u). From the work done it is concluded that a flow channel can be used as an initial method of assessing the relative screening affects of different pulps and possibly different apertures. The method however, has limitations and does not adequately account for the affect of different rotors, higher fibre concentrations and rotor tip speed.

机译：据报道，辐射松牛皮纸浆通过实验室流动通道和狭窄长度的工业压力筛中1mm光滑孔的纤维长度分级。比较筛选结果以确定流道是否可用于预测工业压力筛的分馏行为。使用了两个压力筛转子，即步进转子和缓冲转子。在相似的孔径速度和上游流动条件下，压力筛网的总纤维通过率值高于两个转子的流道。对于大多数纤维级分，单个长度级分的通过率也更高。差异归因于筛网转子的压力脉冲引起的流场的动态特性。压力脉冲引起正向和反向流动，总的纤维通过率是两种流动的综合影响。通过分离比α测量的长度分馏效率在每种情况下都不同。步进转子效率最高，其次是流道，其次是凸块转子。随着归一化速度（V_s / V_u）的增加，所有分离效率均降低。从完成的工作可以得出结论，流动通道可以用作评估不同纸浆和可能不同的孔的相对筛选效果的初始方法。然而，该方法具有局限性，并且不能充分考虑不同转杯，更高的纤维浓度和转杯尖端速度的影响。

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来源
《57th Appita Annual Conference and Exhibition; May 5-7, 2003; Melbourne, Australia》|2003年|p.369-376|共8页
会议地点 Melbourne(AU)
作者
MICHAEL WALMSLEY; MARTIN ATKINS;
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作者单位

Department of Materials Process Engineering University of Waikato New Zealand;

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会议组织
原文格式 PDF
正文语种 eng
中图分类轻工业、手工业;
关键词
pressure screening; fractionation; flow channels; fibre classification; fibre passage; screening mechanisms;

机译：压力筛选;分馏;流动通道;纤维分类;纤维通过;筛选机理;

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Comparing fibre length fractionation of a laboratory flow channel to an industrial pressure screen

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