Influencing factors for apparent viscosity changes of Shengli coaloil slurry
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摘要: 采用高温黏度计测定了胜利褐煤液化油煤浆在常压加热条件下的表观黏度，考察了煤浆质量分数、煤粉粒径、溶剂性质以及温度、剪切时间、剪切速率、溶胀等因素对煤浆体系表观黏度的影响。在常压室温至350℃的范围内，比较了胜利煤在起始溶剂和循环溶剂两种煤浆体系中的表观黏度。研究结果表明，胜利液化油煤浆体系是一种非牛顿流体，随着温度的升高，煤浆体系的黏度呈现先快速下降，然后基本保持不变，最后又逐渐上升的趋势。煤浆黏度保持不变的温度区间和黏度开始出现增加的温度随着煤浆的质量分数、煤粉的粒径以及配制煤浆所用溶剂的不同而不同。Abstract: The apparent viscosity of coal-oil slurry of Shengli was measured using a high-temperature viscometer. Some factors that affect apparent viscosity change of Shengli coal-oil slurry were studied, such as mass fraction, particle size distribution, solvent properties, temperatures, shearing time, shearing rate and solvent swelling. The apparent viscosity of coal-oil slurry was compared in STR and REC from room temperature to approximately 350℃. The results show that Shengli coal-oil slurry is nonNewtonian fluid. Its apparent viscosity decreases firstly, then keeps invariability, finally increases with temperature rising. The temperature range for constant apparent viscosity and temperature for the apparent viscosity beginning to increase depend on solid concentrations, particle size distribution and solvent properties.
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Key words:
- direct liquefaction /
- coal-oil slurry /
- apparent viscosity /
- initial solvent /
- recycle solvent
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