【作者】 熊伟；

【导师】 卢晓江；

【作者基本信息】 天津科技大学 ， 化工过程机械， 2004， 硕士

【摘要】 用圆柱形水力旋流器对纸浆纤维进行了筛分实验。研究了进料量Qf和分流比R(溢流与进料量之比)对筛分的影响。应用纤维质量分析仪对不同浆流的纤维的长度进行了测定并计算了纤维的长度分布密度f。实验研究发现当用水力旋流器分流后，在溢流液中长纤维增加了而在底流液中短纤维增加了。并且还发现当分流比在0.12—0.16之间时分流效果比较好。 提出了新的筛分评价指标-溢流纤维筛分指数M、底流纤维筛分指数N、总纤维筛分指数F来评价筛分效果。研究结果表明，分流比是对纤维筛分效果影响最显著的因素，进料量对筛分的效果影响程度较小。对M、N、F结果的分析表明，M越大溢流中的较长纤维所占比例较大，N越大底流中较短纤维所占比例较大，F越大表示水力旋流器的筛分效果越明显。更多还原

【Abstract】 Fractionation of softwood pulp fiber were carried out with a cylindrical hydrocyclone. The effects of feed rate and split ratio (overflow rate to feed rate ratio) on fractionation of pulp fiber are studied. Pulp fiber length characterization in different streams have been examined using FQA, and the fiber length fractionation density function f is calculated and the separation index H(L) is used to evaluate fiber fractionation performance for different streams. It is shown that, the split ratio is the most significant parameter for fiber fractionation performance and the fractionation performance is excellent with split ratio in the range between 0.12 and 0.16. There is a high proportion of fibers longer than the critical fiber length in the overflow stream, and there is a high proportion of fibers shorter than the critical fiber length in the underflow stream.Defining three new indexes-the overflow separation index M , the underflow separation index N and the total separation index F are used to evaluate fiber fractionation performance for different streams. It is shown that, the split ratio is the most significant parameter for fiber fractionation performance .But the effect of feed rate on fiber fractionation performance is weak..Results of M, N, F have show that , there is a high proportion of longer fiber in the overflow when M is higher , there is a high proportion of shorter fiber in the underflow when N is higher and there will be a good fiber fractionation performance when F is higher.更多还原