化工学报 ›› 2021, Vol. 72 ›› Issue (10): 5040-5052.DOI: 10.11949/0438-1157.20210462

• 热力学 • 上一篇    下一篇

基于晶体生长及形貌的煤灰渣黏温模型

沈中杰(),郭晓镭,梁钦锋,刘海峰()   

  1. 上海市煤气化工程技术研究中心,华东理工大学,上海 200237
  • 收稿日期:2021-04-06 修回日期:2021-07-03 出版日期:2021-10-05 发布日期:2021-10-05
  • 通讯作者: 刘海峰
  • 作者简介:沈中杰(1989—),男,博士,特聘副研究员,zjshen@ecust.edu.cn
  • 基金资助:
    国家重点研发计划项目(2018YFB0604102)

Development of coal ash/slag viscosity-temperature model based on crystal growth and morphologies

Zhongjie SHEN(),Xiaolei GUO,Qinfeng LIANG,Haifeng LIU()   

  1. Shanghai Engineering Research Center of Coal Gasification, East China University of Science and Technology, Shanghai 200237, China
  • Received:2021-04-06 Revised:2021-07-03 Online:2021-10-05 Published:2021-10-05
  • Contact: Haifeng LIU

摘要:

采用高温热台显微镜研究了非牛顿煤灰渣结晶过程的晶体生长规律及形貌特征,获得不同化学组成煤渣晶体的种类转变和长宽比变化等参数。基于实验获得的晶体生长规律,耦合晶体形貌、长宽比及熔渣固相随温度的变化关系式,修正悬浮液的黏度模型,建立了适用于非牛顿熔渣的黏温预测模型,并与实测黏温曲线对比和验证。该模型考虑了主要析出以单斜晶系或三斜晶系特征的长石类、黄长石、钙长石和镁硅钙石等单相和多相晶体形貌特征,并结合煤渣固相分数(范围0≤?≤0.8)和长宽比(1.0~16.0)等参数修正。结果发现,模型对于煤渣酸碱比范围为0.5~3.0,煤渣硅铝含量总和35%~70%(质量)范围,CaO含量低于30%(质量)、MgO含量为0~10%(质量)以及Fe2O3含量范围低于16%(质量)的煤渣黏度预测适用性较好。

关键词: 气化, 煤灰渣, 结晶, 黏度, 模型

Abstract:

A high-temperature hot-stage microscope was used to study the crystal growth rule and morphological characteristics of the crystallization process of non-Newtonian coal ash slag, and obtain parameters such as the type transformation and the aspect ratio change of the cinder crystals with different chemical compositions. Based on the crystal growth rule from the experiment, the viscosity model of the suspension was modified coupled with the crystal morphology, aspect ratio and the relationship between the slag solid phase and temperature. A viscosity-temperature prediction model suitable for non-Newtonian slag was established in this study, which was compared and verified with the measured viscosity-temperature curve. The model considered the single-phase and multiphase crystal morphology features of feldspar, melilite, anorthite, and merwinite, etc., mainly precipitated as monoclinic or triclinic crystal systems. The model was also modified by combining the parameters of solid fraction of coal slag (range 0≤? ≤0.8) and aspect ratio (1.0—16.0). The results showed that the model was limited as listed conditions, including acidity/basicity ratio of coal slags with ranged of 0.5—3.0, the total content of silicon and aluminum oxides from 35% to 70%(mass), the CaO content lower than 30%(mass), MgO content from 0 to 10%(mass), and the Fe2O3 content lower than 16%(mass).

Key words: gasification, coal ash/slag, crystallization, viscosity, model

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