纸浆纤维悬浮液的固液界面接触起电机理研究

当前，现代高速宽幅纸机采用稀释水流浆箱调节纸幅定量偏差的控制策略存在大滞后、强耦合及多干扰等缺陷，将浓度测量变送环节前置是克服这些缺陷的有效手段，对于保证纸幅匀度以及纸机经济、稳定运行意义重大。项目拟通过设计不同介电特性的固液界面，研究纤维悬浮液在不同界面化学环境中的固液接触起电响应，阐明材料的得失电子能力对静电响应的影响规律；其次，通过合理设计界面微观结构，研究粗糙度对固液电荷转移的微观调控机理，揭示边界滑移条件与界面静电响应间的关联机制；最后，通过研究不同浓度纤维悬浮液在层流和湍流状态下的固液接触起电变化历程，阐明边界层内纤维与水耦合作用下的摩擦起电机制，建立静电响应与纸浆浓度、湍动雷诺数间的函数变化关系。本项目研究成果对于进一步发展与完善固液界面能质传递理论具有重要科学意义,为开发和实现基于摩擦起电响应的纸浆纤维悬浮液浓度监测与测量技术提供基础理论依据，具有广阔的应用前景。

At present, the control strategy of using dilution water headbox to adjust the basis weight deviation of paper sheet in modern high-speed wide width paper machine has some defects, such as serious delay, strong coupling and multi disturbance. It is an effective way to overcome these defects to put the concentration measurement and transmission in front, which is of great significance to ensure the uniformity of the paper sheet and the economic and stable operation of the paper machine. In this project, the triboelectrification properties of fiber suspension in different interface chemical environments are studied by designing solid-liquid interfaces of different dielectric properties, and the influence of the gain and loss electronic ability of the materials on the electrostatic response is clarified; Secondly, by reasonably designing the interface microstructure, the regulation mechanism of roughness on solid-liquid charge transfer is studied, and the correlation mechanism between boundary slip condition and interface electrostatic response is revealed；Finally, the flow characteristics of pulp suspensions in channels will be explored, the electrostatic response of solid-liquid interfaces are clarified accordingly, and the functional relationship between electrostatic response and turbulent Reynolds number and mass concentration will be established, and the mechanism will be analyzed. This project could provide important scientific significance for the further development and improvement energy and mass transfer theory of solid-liquid interfaces, and provides a basic theoretical basis for the development and realization of pulp fiber suspension concentration monitoring and measurement technology based on triboelectrification response, and has a broad application prospect.