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

doi:10.1016/j.cjche.2020.04.001

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (12): 3110-3116.DOI: 10.1016/j.cjche.2020.04.001

• Energy, Resources and Environmental Technology • 上一篇下一篇

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 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

收稿日期:2020-01-06 修回日期:2020-03-28 出版日期:2020-12-28 发布日期:2021-01-11
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).

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 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:2020-12-28 Published:2021-01-11
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).

摘要/Abstract

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

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

Feng Wang, Min Yao, Haoyong Kan, Jianping Kuang, Ping Li, Jiashuo Zhang, Yixin Zhang. Effect of Al₂O₃/CaO on the melting and mineral transformation of Ningdong coal ash[J]. 中国化学工程学报, 2020, 28(12): 3110-3116.

Feng Wang, Min Yao, Haoyong Kan, Jianping Kuang, Ping Li, Jiashuo Zhang, Yixin Zhang. Effect of Al₂O₃/CaO on the melting and mineral transformation of Ningdong coal ash[J]. Chinese Journal of Chemical Engineering, 2020, 28(12): 3110-3116.

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

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

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