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浆料的漂白成本十分昂贵,制浆厂浆板机白水的质量会影响漂白浆的最终白度,造成漂白成本的增加。因而,对浆板机白水质量进行监测可控制成本损失。文章介绍了一种评估白水质量的方法,该方法可区分白水中的纤维(fibres)、细小纤维(fines)和可溶性固形物(DS)组分的作用及其对漂白浆白度的影响。结果表明,不同工厂的白水质量差异较大。浆料的白度损失主要受白水中细小纤维组分的影响,其含量及色度对浆料白度的影响较大,而DS对于浆料光学性能的影响较小。白水中的这3种组分对浆料返黄的影响不大(阔叶木浆的细小纤维组分除外)。因此,有必要在浆板机现场使用白水质量监控程序,用于诊断和预防浆料白度问题的发生,该监测系统有助于降低漂白成本。
The bleaching cost of the pulp is very expensive. The quality of the white pulp in the pulp mill can affect the final whiteness of the bleached pulp, resulting in an increase of the bleaching cost. Thus, monitoring the quality of paddle white water can control the cost of loss. This article describes a method for assessing the quality of white water by distinguishing the effects of white, water soluble fines (DS) components and bleaching pulp whiteness. The results show that the quality of white water varies greatly from plant to plant. The whiteness loss of the slurry is mainly affected by the fine fiber component in the white water. The content and chroma of the slurry have a greater effect on the whiteness of the slurry, while the DS has less influence on the optical properties of the slurry. The three components in whitewater have little effect on the yellowing of the slurry (except for the fine fiber component of hardwood pulp). Therefore, it is necessary to use a white water quality monitoring program on the pulp mill site to diagnose and prevent the occurrence of pulp whiteness problems, which helps to reduce bleaching costs.