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作 者:柴志方[1] 曾鸣[1] 张瑞杰[1] 冯来宏 王帅[1] 姬文心 CHAI Zhifang;ZENG Ming;ZHANG Ruijie;FENG Laihong;WANG Shuai;JI Wenxin(School of Chemical&Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
机构地区:[1]中国矿业大学(北京)化学与环境工程学院,北京100083
出 处:《煤炭学报》2019年第S01期249-255,共7页Journal of China Coal Society
基 金:国家自然科学基金面上资助项目(51274208)。
摘 要:目前常用的水煤浆稳定性评价方法均存在测试周期较长、表征结果不准确等问题。为了缩短水煤浆稳定性的测试周期,选取了温度作为加速试验条件,采用Turbiscan Lab稳定性分析仪客观、定量地研究了温度30~55℃对水煤浆稳定性的影响。结果表明,在测试时间内,随着温度的升高,由仪器给出的水煤浆稳定性指数TSI值逐渐增大,说明浆体越来越不稳定。此外,为了解释温度对水煤浆稳定性的影响,对水煤浆的表观黏度和煤颗粒粒径随温度的变化也进行了研究。研究发现,随着温度的升高,水煤浆的表观黏度降低,由1194 mPa·s下降到702 mPa·s,由稳定性分析仪软件计算得出的煤颗粒聚结的速率加快,其平均粒径分别增大了2.4和3.6μm。根据斯托克斯定律,这些变化都会加速浆体中煤颗粒的沉降进而破坏浆体的稳定性。据此,以稳定性指数TSI值尝试建立了水煤浆稳定性随温度变化的动力学曲线,相关系数R=0.985,说明其线性相关性较好,即试验所用瘦煤水煤浆的稳定性随温度的增加近似呈线性下降。利用此模型可以计算得出45,50和55℃的加速比AR分别为1.9,2.3和2.7,这与利用稳定性分析仪从宏观角度所测出的分层厚度和计算得出的相分离指数(PSI)来表征水煤浆稳定性的评价结果相接近。因此,升高温度能够作为一种切实可行的方法快速、准确地评价水煤浆的稳定性。To shorten the testing duration on the static stability of coal water slurry(CWS),the temperature was selected as an acceleration factor and its influence on the static stability of CWS at 30℃to 55℃was studied quantitatively and objectively by using Turbiscan Lab analyzer in this study.Moreover,the apparent viscosity and the variation of particles mean diameter were measured to elucidate the effect of temperature on the static stability of CWS.The results showed that the increase in temperature was associated with a decrease in the apparent viscosity of CWS.Meanwhile,the particles mean diameter gradually increased.The changes of these slurry properties facilitated particles settling and therefore deteriorated the static stability of CWS.According to the findings mentioned above,a prediction model on the static stability of CWS sample was established.From this model,the acceleration ratio(AR)could be calculated,the AR values at 45,50 and 55℃were 1.9,2.3 and 2.7 respectively,which were consistent with the data of phase separation index(PSI)measured by Turbiscan Lab analyzer from the macroscopic perspective.Therefore,rising temperature is a feasible way to rapidly,quantitatively and accurately evaluate the static stability of CWS.
分 类 号:TQ536[化学工程—煤化学工程]
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