• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Separation and Purification Technology >Aspects on metal ion distribution models in pulp washing simulation
【24h】

Aspects on metal ion distribution models in pulp washing simulation

机译：纸浆洗涤模拟中金属离子分布模型的各个方面

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The closure of the liquid system in a pulp mill has increased the concentration of metal ions in the process as compared to traditional plants. These ions commonly referred to as non-process elements, NPE, enter the pulp mill with the wood chips, the water supply and the pulping chemicals. The presence of these ions may lead to various problems, e.g. incrust formation, filtration failures and reduced bleaching efficiency and the objective of the pulp washing operation is to remove a major part of these metal ions from the pulp. The objective of this work was to study the influence of sorption of metal ions on the simulation of pulp washing. A process simulator, ASPEN Plus, has been used to describe the different steps in a displacement drum washer. In order to take account of the sorption of metal ions on the pulp fibres blocks with FORTRAN subroutines have been developed and included. The simulations studies show that the washing results are quite similar for all models at high concentration levels. Hence, the adsorption does not contribute significantly except for low concentration cases. The influence of the sorption model and thus also the choice of model is important only in washing stages where the concentration of ions is very low. Comparison with data for an industrial displacement drum washer indicated the usefulness of the simulation model in evaluation of the operation. It was found that the displacement-washing step was far from ideal probably due to uneven liquid distribution and formation problems. For washing of solids other than paper pulp, e.g. lime mud, the effect of sorption metal ions on the washing result is less pronounced and a simpler model can be used with good results.
机译：与传统工厂相比，制浆厂中液体系统的关闭增加了该过程中金属离子的浓度。这些离子通常称为非工艺元素NPE，随木屑，供水和制浆化学品一起进入制浆厂。这些离子的存在可能会导致各种问题，例如。结垢，过滤失败和降低的漂白效率，并且纸浆洗涤操作的目的是从纸浆中去除这些金属离子的大部分。这项工作的目的是研究金属离子吸附对纸浆洗涤模拟的影响。过程仿真器ASPEN Plus已用于描述置换式滚筒洗衣机的不同步骤。为了考虑金属离子在纸浆纤维上的吸附，已经开发并包括了带有FORTRAN子程序的模块。模拟研究表明，所有模型在高浓度下的洗涤结果都非常相似。因此，除了低浓度的情况外，吸附作用不大。吸附模型的影响以及模型的选择仅在离子浓度非常低的洗涤阶段才很重要。与工业置换鼓式洗衣机的数据进行比较表明，仿真模型在操作评估中非常有用。发现置换洗涤步骤可能不理想，这可能是由于液体分布不均匀和形成问题所致。用于洗涤纸浆以外的固体，例如对于石灰泥，吸附金属离子对洗涤结果的影响不太明显，可以使用较简单的模型获得良好的结果。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号