ACOUSTOPHORESIS FOR PULP SEPARATION

在纸浆和造纸厂，需要有效的技术来去除积累的固体悬浮物，以优化原材料的使用，并由于环境法规的原因关闭水系统。作为一种新的固体去除方法，超声波澄清白水的方法似乎很有前途。对于白水流澄清，其想法是使用来自超声波波场(声阻导入)的辐射力对流动的纤维施加法向力，以迁移纤维，从而增加纸浆流的稠度。*本项目旨在确定在工业环境中可行的纸浆处理的最佳配置。为了得到最优的换能器配置，将开发数值和实验方法。然后，将根据行业合作伙伴的推荐和项目第一阶段获得的初步结果提出新的概念设计。*如果超声波纸浆分离的概念可以扩展到工业规模，这种方法将是加拿大纸浆和造纸行业的重大突破，特别是GL&V，它能够最大限度地减少安装占地面积，降低运营成本和能源消耗，同时减少单位纸浆或纸张生产的水耗和更广泛的环境影响。*

In pulp and paper mills, efficient techniques are required to remove accumulating solid suspensions in order to optimize raw material usage and closing up water systems due to environmental regulations. As a novel approach to solid removal, an ultrasonic method to clarify a white-water stream appears promising. For white-water stream clarification, the idea is to apply a normal force on flowing fibers using radiation force coming from an ultrasonic wave field (acoustophoresis), for the purpose of migrating the fibers and thus increasing the consistency of the pulp stream. ****This projects aims at determining the optimal configuration for feasible pulp manipulation in industrial environment. Both numerical and experimental methodologies will be developed in order to derive the optimal transducer configuration. Then, novel conceptual design will be proposed based on recommendation from the industrial partner and the preliminary results obtained in the first phase of the project. ****If the concept of ultrasonic pulp separation can be extended to industrial scale, this approach would be a major breakthrough for the Canadian pulp and paper industry and especially GL&V by enabling a minimization of installation footprint, reduction of operating cost and energy consumption, while reducing water consumption and more generally environmental impact per unit of pulp or paper production.******