SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (12): 3110-3116.DOI: 10.1016/j.cjche.2020.04.001

• Energy, Resources and Environmental Technology • Previous Articles     Next Articles

Effect of Al2O3/CaO on the melting and mineral transformation of Ningdong coal ash

Feng Wang1, Min Yao2, Haoyong Kan1, Jianping Kuang2, Ping Li1, Jiashuo Zhang2, Yixin Zhang3   

  1. 1 State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China;
    2 Ningxia Shenyao Technology Co. Ltd., Yinchuan 750000, China;
    3 China University of Mining and Technology, Xuzhou 221116, China
  • Received:2020-01-06 Revised:2020-03-28 Online:2021-01-11 Published:2020-12-28
  • Contact: Ping Li
  • Supported by:
    This work was supported by the Key Research and Development Program of Ningxia (2018BCE01004), Natural Science Foundation of Ningxia (2018AAC03013), Discipline Project of Ningxia (NXYLXK2017A04).

Effect of Al2O3/CaO on the melting and mineral transformation of Ningdong coal ash

Feng Wang1, Min Yao2, Haoyong Kan1, Jianping Kuang2, Ping Li1, Jiashuo Zhang2, Yixin Zhang3   

  1. 1 State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China;
    2 Ningxia Shenyao Technology Co. Ltd., Yinchuan 750000, China;
    3 China University of Mining and Technology, Xuzhou 221116, China
  • 通讯作者: Ping Li
  • 基金资助:
    This work was supported by the Key Research and Development Program of Ningxia (2018BCE01004), Natural Science Foundation of Ningxia (2018AAC03013), Discipline Project of Ningxia (NXYLXK2017A04).

Abstract: Coal ash melting characteristics has a direct impact on the smooth operation of entrained gasifier. Mineral conversion of coal ash is very significant to be investigated, because the mineral can affect the melting temperature and viscosity under high temperature conditions. In this paper, the effects of different Al2O3/CaO on the mineral conversion, melting temperature and viscosity of Ningdong coal ash are studied by the combination of experiment and simulation. The trend of melting temperature decreases firstly and rises with increasing Al2O3/CaO. The ash melting point reached to the lowest when the ratio is 1.23. XRD and Factsage software are used to analyze crystallization behavior of samples. The results show that the content of anorthite, albite and corundum increases and subsequently decreases, while the content of mullite decreases firstly and then rises with increasing Al2O3/CaO. High content with CaO can contribute to form albite and anorthite of low-melting. Besides, high content with Al2O3 can tend to produce mullite of high-melting. The results of experimental and simulation are basically the same, which lays a foundation for the melting characteristics of Ningdong coal ash and can provide technical support for the smooth operation of the entrained-gasifier.

Key words: Melting characteristics, Viscosity, Mineral transformation, Al2O3/CaO

摘要: Coal ash melting characteristics has a direct impact on the smooth operation of entrained gasifier. Mineral conversion of coal ash is very significant to be investigated, because the mineral can affect the melting temperature and viscosity under high temperature conditions. In this paper, the effects of different Al2O3/CaO on the mineral conversion, melting temperature and viscosity of Ningdong coal ash are studied by the combination of experiment and simulation. The trend of melting temperature decreases firstly and rises with increasing Al2O3/CaO. The ash melting point reached to the lowest when the ratio is 1.23. XRD and Factsage software are used to analyze crystallization behavior of samples. The results show that the content of anorthite, albite and corundum increases and subsequently decreases, while the content of mullite decreases firstly and then rises with increasing Al2O3/CaO. High content with CaO can contribute to form albite and anorthite of low-melting. Besides, high content with Al2O3 can tend to produce mullite of high-melting. The results of experimental and simulation are basically the same, which lays a foundation for the melting characteristics of Ningdong coal ash and can provide technical support for the smooth operation of the entrained-gasifier.

关键词: Melting characteristics, Viscosity, Mineral transformation, Al2O3/CaO