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OALib Journal期刊
ISSN: 2333-9721
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褐煤中水分对油煤浆流变性质的影响
, PP. 1281-1285
Keywords: 褐煤,水分,油煤浆,流变性
Abstract:
？针对云南褐煤,用真空干燥脱水和恒温恒湿箱处理获得了不同含水率的褐煤,在常温常压(t=19.3℃,p=1.01×105pa)条件下研究了褐煤含水率对油煤浆流变特性的影响.研究表明,原料煤含水率对油煤浆黏度和流变特性有一定的影响.随褐煤含水率增加,油煤浆黏度先减小后增加.油煤浆浓度不同,剪切速率不同,黏度出现最低值的含水率值wmin也不同.浓度为45.45%的油煤浆,剪切速率小于4.4s-1时,wmin为9.20%;剪切速率大于4.4s-1时,wmin为7.80%.浓度为55.56%的油煤浆,剪切速率小于1.32s-1时,wmin为7.40%;剪切速率大于1.32s-1时,wmin为10.00%.随剪切速率变化,油煤浆黏度上下行曲线之间形成滞后环,表明油煤浆体系有触变性,并且不同含水率煤浆体系触变性不同,含水率越大,触变性越明显.实验中不同含水率褐煤油煤浆都属于假塑性流体,且含水率对模型参数有一定的影响.
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