文献类型：期刊文献

英文题名：Rheological evolution and crystallization response of molten coal ash slag at high temperatures

作者：Song, Wenjia[1,2,3];Tang, Lihua[1];Zhu, Zibin[1];Ninomiya, Yoshihiko[3]

机构：[1]E China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Univ Munich, Dept Earth & Environm Sci, D-80333 Munich, Germany;[3]Chubu Univ, Dept Appl Chem, Kasugai, Aichi 4878501, Japan

年份：2013

卷号：59

期号：8

起止页码：2726

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20133116556215);WOS:【SCI-EXPANDED(收录号:WOS:000321960400003)】；

语种：英文

外文关键词：coal gasification; coal combustion; coal ash slag

摘要：Ash-related problems are often the main reason for entrained-flow gasifiers and boilers unscheduled shut downs. Thus, understanding the high-temperature physical properties of molten coal ash slag may enable an accurate description of the condition of ash deposition in the gasifier and boiler. The evolution of the time dependence of rheological behaviors, including the viscosity and yield stress of the molten coal ash slag containing 0-35.51 vol % crystals at decreasing temperatures (1400-1280 degrees C) and within 1.05 x 10(5) s, were investigated. Non-Newtonian behaviors, including shear thinning, become obvious with an increasing crystal contents. The trends in the change of crystal nucleation rate in molten coal ash slag are similar with those of the growth rate. Finally, the experimental results and the crystal-size distribution method are used to develop a semiempirical parameterization that describes the complex non-Newtonian rheology of crystal-bearing molten coal ash slag. (c) 2013 American Institute of Chemical Engineers AIChE J, 59: 2726-2742, 2013