Effect of slag composition on corrosion resistance of high chromia refractory bricks for industrial entrained-flow gasifier

doi:10.1016/j.cjche.2023.03.026

中国化学工程学报 ›› 2023, Vol. 62 ›› Issue (10): 139-149.DOI: 10.1016/j.cjche.2023.03.026

• Full Length Article • 上一篇下一篇

Effect of slag composition on corrosion resistance of high chromia refractory bricks for industrial entrained-flow gasifier

Jinghong Gao¹, Weiguang Su¹, Xudong Song¹, Peng Lv¹, Jun Yang², Guangsuo Yu^1,3

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. Chinese Energy Ningxia Coal Industry Co., Ltd., Yinchuan 750021, China;
3. Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai 200237, China

收稿日期:2022-12-19 修回日期:2023-03-22 出版日期:2023-10-28 发布日期:2023-12-23
通讯作者: Weiguang Su,E-mail:weiguangsu@nxu.edu.cn;Guangsuo Yu,E-mail:gsyu@nxu.edu.cn
基金资助:
The authors gratefully acknowledge financial support from the Joint Funds of the National Natural Science Foundation of China (U21A20318).

Effect of slag composition on corrosion resistance of high chromia refractory bricks for industrial entrained-flow gasifier

Jinghong Gao¹, Weiguang Su¹, Xudong Song¹, Peng Lv¹, Jun Yang², Guangsuo Yu^1,3

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. Chinese Energy Ningxia Coal Industry Co., Ltd., Yinchuan 750021, China;
3. Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai 200237, China

Received:2022-12-19 Revised:2023-03-22 Online:2023-10-28 Published:2023-12-23
Contact: Weiguang Su,E-mail:weiguangsu@nxu.edu.cn;Guangsuo Yu,E-mail:gsyu@nxu.edu.cn
Supported by:
The authors gratefully acknowledge financial support from the Joint Funds of the National Natural Science Foundation of China (U21A20318).

摘要/Abstract

摘要： The slag composition corresponding to different coals varies significantly, which directly affects the operation of industrial entrained-flow gasifier and the service life of refractory bricks. In this study, the corrosion resistance of several typical coal slags for gasification on high chromia refractory bricks was comparatively investigated by static laboratory crucible tests and thermodynamic simulations. The results demonstrated that the corrosion degree of high chromia refractory bricks by different coal slags was high-Ca/Na slag > high-Fe slag > high-Si/Al slag. The surface structure of the refractory was relatively flat after corrosion by high-Si/Al slag, and the primary corrosion reaction was the partial dissolution of the matrix by the slag. High-Fe slag was prone to the precipitation of iron phases as well as the formation of (Mg, Fe) (Al, Cr)₂O₄ composite spinel layer at the slag/refractory interface. The high-Ca/Na slag was susceptible to react with the refractory to yield a low melting point phase, which led to the destruction of the matrix structure of the refractory and an isolated distribution of particles. In addition, the monoclinic ZrO₂ in the refractory reacted with CaO in the slag to formed calcium zirconate, which loosened its phase toughening effect, was the primary factor that aggravated the refractory corrosion.

关键词: Entrained-flow gasifier, Coal slag, High chromia refractory, Corrosion, Permeation, Viscosity

Abstract: The slag composition corresponding to different coals varies significantly, which directly affects the operation of industrial entrained-flow gasifier and the service life of refractory bricks. In this study, the corrosion resistance of several typical coal slags for gasification on high chromia refractory bricks was comparatively investigated by static laboratory crucible tests and thermodynamic simulations. The results demonstrated that the corrosion degree of high chromia refractory bricks by different coal slags was high-Ca/Na slag > high-Fe slag > high-Si/Al slag. The surface structure of the refractory was relatively flat after corrosion by high-Si/Al slag, and the primary corrosion reaction was the partial dissolution of the matrix by the slag. High-Fe slag was prone to the precipitation of iron phases as well as the formation of (Mg, Fe) (Al, Cr)₂O₄ composite spinel layer at the slag/refractory interface. The high-Ca/Na slag was susceptible to react with the refractory to yield a low melting point phase, which led to the destruction of the matrix structure of the refractory and an isolated distribution of particles. In addition, the monoclinic ZrO₂ in the refractory reacted with CaO in the slag to formed calcium zirconate, which loosened its phase toughening effect, was the primary factor that aggravated the refractory corrosion.

Key words: Entrained-flow gasifier, Coal slag, High chromia refractory, Corrosion, Permeation, Viscosity

Jinghong Gao, Weiguang Su, Xudong Song, Peng Lv, Jun Yang, Guangsuo Yu. Effect of slag composition on corrosion resistance of high chromia refractory bricks for industrial entrained-flow gasifier[J]. 中国化学工程学报, 2023, 62(10): 139-149.

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Effect of slag composition on corrosion resistance of high chromia refractory bricks for industrial entrained-flow gasifier

Effect of slag composition on corrosion resistance of high chromia refractory bricks for industrial entrained-flow gasifier

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