煤灰在高温下的流变特性研究

袁海平 梁钦锋 刘海峰 龚欣

引用本文: 袁海平, 梁钦锋, 刘海峰, 龚欣. 煤灰在高温下的流变特性研究[J]. 燃料化学学报, 2012, 40(10): 1167-1171. shu
Citation:  YUAN Hai-ping, LIANG Qin-feng, LIU Hai-feng, GONG Xin. Rheological properties of coal ash at high temperatures[J]. Journal of Fuel Chemistry and Technology, 2012, 40(10): 1167-1171. shu

煤灰在高温下的流变特性研究

    通讯作者: 龚欣,E-mail:gongxin@ecust.edu.cn。
  • 基金项目:

    国家自然科学基金(21106046) (21106046)

    国家重点基础研究发展规划(973计划, 2010CB227005) (973计划, 2010CB227005)

    国家高技术研究发展计划(863计划, 2008AA05031)。 (863计划, 2008AA05031)

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。

English

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  • 收稿日期:  2011-12-13
  • 网络出版日期:  2012-02-23
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