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Prediction Method on the Static Stability of a Coal Water Mixture
- Chai, Zhifang, Zeng, Ming, Ren, Yangguang, Zhang, Ruijie, Feng, Laihong, Zhao, Zhifu
- Energy & fuels 2019 v.33 no.5 pp. 3998-4008
- coal, dispersants, equations, models, prediction, slurries, temperature, viscosity
- To shorten the testing duration on the static stability of a coal water mixture (CWM), the temperature was selected as an acceleration factor and its influence on the static stability of the CWM was studied quantitatively and objectively using a Turbiscan Lab analyzer. Moreover, the apparent viscosity and variation of the particle mean diameter were tested to elucidate the effect of the temperature on the static stability of the CWM. The results showed that the increase in the temperature caused more dispersant adsorbed onto the coal surface and contributed to the increase of pseudo-plasticity and decrease of apparent viscosity of the CWM; meanwhile, the particle mean diameter gradually increased. The changes of these slurry properties facilitated particle settling and, therefore, deteriorated the static stability of the CWM. Furthermore, the effect of the temperature on the apparent viscosity and variation of the particle mean diameter was fitted well by the Arrhenius equation. According to this, a prediction model on the static stability of the CWM was established. From this model, the acceleration ratio (AR) could be calculated, which was consistent with the data of the water-bleeding ratio (WBR) measured by the Turbiscan Lab analyzer from the macroscopic perspective. Therefore, a rising temperature is a feasible way to rapidly, quantitatively, and accurately evaluate the static stability of the CWM.