煤
流变学
熔渣(焊接)
成核
冶金
材料科学
结晶
木材气体发生器
Crystal(编程语言)
矿物学
热力学
化学工程
化学
废物管理
复合材料
工程类
程序设计语言
物理
计算机科学
作者
Wenjia Song,Lihua Tang,Zibin Zhu,Yoshihiko Ninomiya
出处
期刊:Aiche Journal
[Wiley]
日期:2013-02-05
卷期号:59 (8): 2726-2742
被引量:24
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°C) and within 1.05 × 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. © 2013 American Institute of Chemical Engineers AIChE J , 59: 2726–2742, 2013
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