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| Dynamic Viscoelasticity of Thick Bamboo Kraft Pulping Black Liquor at High Temperature |
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| DOI：10.11980/j.issn.0254-508X.2017.11.004 |
| Key Words:bamboo kraft black liquor dynamic viscoelasticity storage modulus dynamic viscosity |
| Fund Project:国家十二五科技支撑计划项目课题（2012BAD23B02）。 |
| Author Name | Affiliation | | 岳小鹏1，2 | 1.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,陕西西安,710021；2.轻化工程国家级实验教学示范中心（陕西科技大学）,陕西西安,710021 | | 杜 鑫1，2，3 | 1.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,陕西西安,710021；2.轻化工程国家级实验教学示范中心（陕西科技大学）,陕西西安,710021
3.陕西科技大学机电工程学院,陕西西安,710021 | | 徐永建1，2，* | 1.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,陕西西安,710021；2.轻化工程国家级实验教学示范中心（陕西科技大学）,陕西西安,710021 |
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| Abstract:It has become a development trend that the black liquor was burned at a high solid content in alkali recovery unit. Hence, it is significant to learn and master the rheological properties of thick black liquor in order to optimize the combustion technology. The change rules of storage modulus G′, loss modulus G″, loss factor tanδ and dynamic viscosity η′, which were important indicators of the dynamic viscoelasticity of thick bamboo kraft pulping black liquor, were investigated by using a rotational rheometer in this article. The results proved that thick black liquor still exhibited obvious elastic solid properties at high temperature. In addition, dynamic viscosity showed distinct shear-thinning behavior. Black liquor could be softened by increasing the temperature. meanwhile the relaxation time of chain segments and dynamic viscosity were decreased, therefor, the flow resistance of black liquor was reduced. Cross model could very well describe the relation between η′ of thick black liquor and angular frequency ω under high temperature conditions. However, the Carreau-Yasuada model could not be used to describe the relation between loss angle δ and ω． |
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