煤灰在高温下的流变特性研究

袁海平; 梁钦锋; 刘海峰; 龚欣

煤灰在高温下的流变特性研究

华东理工大学煤气化教育部重点实验室, 上海 200237

基金项目: 国家自然科学基金(21106046); 国家重点基础研究发展规划(973计划, 2010CB227005); 国家高技术研究发展计划(863计划, 2008AA05031)。

详细信息

通讯作者:
龚欣,E-mail:gongxin@ecust.edu.cn。

中图分类号: TQ531.9
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出版历程
- 收稿日期: 2011-12-13
- 修回日期: 2012-02-23
- 刊出日期: 2012-10-31

Rheological properties of coal ash at high temperatures

Key Laboratory of Coal Gasification of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

摘要

摘要: 为了研究煤灰在高温下的流变特性,以陕西神木煤、内蒙纳林沟煤、宁夏羊肠湾煤和山东南屯煤四种煤灰为样品,利用高温旋转黏度计,研究了高温下煤灰渣黏度和剪切应力随剪切速率的变化。实验结果表明,当实验温度高于煤灰的液相线温度时,其流型表现为牛顿流体;当温度低于液相线温度时,其流型逐渐由牛顿流体转变为非牛顿流体。其中,陕西神木煤和宁夏羊肠湾煤的煤灰样品在高温下表现为剪切增稠,随着温度的降低,由牛顿流体转变为屈服涨塑性流体;内蒙纳林沟煤和山东南屯煤的煤灰样品在高温下表现为剪切变稀,随着温度的降低,由牛顿流体转变为屈服假塑性流体。另外,随着温度的降低,由于液态煤灰中晶体的不断析出,使屈服应力逐渐增大,降低了煤灰的流动性。
- 煤灰 /
- 黏度 /
- 流变特性 /
- 屈服应力
Abstract: Four coal samples including Shenmu coal from Shaanxi, Nalingou coal from Inner Mongolia, Yangchangwan coal from Ningxia and Nantun coal from Shandong were prepared for the research on the rheological properties of coal ash at high temperatures. The high temperature rotational viscometer was used to study the effect of shear rate on the shear stress and viscosity of coal ash. The results indicate that the coal ash slag falls into a Newtonian fluid when the temperature is above the liquidus temperature, while it gradually turns into non-Newtonian fluid when the temperature is below the liquidus temperature. Shenmu and Yangchangwan coal ash owns the plastic and shear-thicking characteristics, while Nalingou and Nantun coal ash has the pseudoplastic and shear-thinning characteristics. Meanwhile, the crystals are formed with the decrease of temperature, which makes the yield stress increase and the flowability of coal ash slag decrease.
- coal ash /
- viscosity /
- rheological properties /
- yield stress

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参考文献(14)

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