高浓竹浆黑液高温动态黏弹性研究

发布时间：2018-05-10 19:34

本文选题：竹浆黑液 + 动态黏弹性　；参考：《中国造纸》2017年11期

【摘要】：实现造纸黑液的高浓燃烧已成为碱回收单元的发展趋势,了解并掌握高浓黑液的流变学性质对优化改进黑液燃烧技术具有重要意义。本研究利用动态流变仪对高浓竹浆黑液的动态黏弹性进行了研究,阐明了储能模量(G')、损耗模量(G″)、损耗因子(tanδ)与动态黏度(η')的变化规律。结果表明,高浓竹浆黑液在高温下表现出较强的弹性固体性质,动态黏度呈现出显著的剪切稀化特性。提高温度有助于黑液软化,缩短链段松弛时间,降低动态黏度,减小流动阻力。Cross模型可以很好地描述高温条件下高浓竹浆黑液η'与角频率(ω)的关系,但Carreau-Yasuada模型不适用于描述耗散角(δ)与ω的关系。
[Abstract]:The realization of high concentration combustion of black liquor in papermaking has become the development trend of alkali recovery unit. It is of great significance to understand and master the rheological properties of high concentrated black liquor for optimizing and improving the combustion technology of black liquor. The dynamic viscoelasticity of black liquor of high consistency bamboo pulp was studied by means of dynamic rheometer. The changes of storage modulus, loss modulus G ", loss factor tan 未) and dynamic viscosity (畏) were elucidated. The results showed that the black liquor of high concentration bamboo pulp had strong elastic solid properties at high temperature and the dynamic viscosity showed obvious shear thinning property. Increasing temperature can help to soften black liquor, shorten relaxation time of chain segment, reduce dynamic viscosity and decrease flow resistance. Cross model can well describe the relationship between black liquor 畏 'and angular frequency (蠅) of high concentration bamboo pulp at high temperature. However, the Carreau-Yasuada model is not suitable to describe the relationship between dissipation angle (未) and 蠅.
【作者单位】：陕西科技大学陕西省造纸技术及特种纸品开发重点实验室;轻化工程国家级实验教学示范中心(陕西科技大学);陕西科技大学机电工程学院;
【基金】：国家十二五科技支撑计划项目课题(2012BAD23B02)
【分类号】：X793

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