文献类型：期刊文献

英文题名：Exploring influence of MgO/CaO on crystallization characteristics to understand fluidity of synthetic coal slags

作者：Li, Meng[1];Xu, Jianliang[1];Xiao, Huixia[1];Liu, Xia[1];Yu, Guangsuo[1,2];Chen, Xueli[1]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[2]Ningxia Univ, State Key Lab High Efficiency Utilizat Coal & Gree, Yinchuan 750021, Peoples R China

年份：2023

卷号：53

起止页码：1

外文期刊名：CHINESE JOURNAL OF CHEMICAL ENGINEERING

收录：;EI(收录号：20225313323934);WOS:【SCI-EXPANDED(收录号:WOS:000915027400001)】；

基金：Acknowledgements This research was financially supported by the National Natural Science Foundation of China (21878082) .

语种：英文

外文关键词：Crystallization characteristics; Fluidity; Slags; MgO; CaO

摘要：The crystallization has significant influence on fluidity of slag and slag discharge of entrained-flow-bed (EFB) gasifier. The crystallization characteristics and fluidity of five synthetic slags with different MgO/ CaO ratios prepared on the basis of the range of oxide contents of Zhundong coal ash were investigated in this study. The results show that with the MgO/CaO ratio increase, the initial crystallization temperature increases, and the main temperature range of crystallization ratio growth moves to higher temperature range gradually which causes Tp25 (Tp25 is the temperature corresponding to the viscosity of 25 Pa.s) to increase. Mg-rich crystals are formed preferentially than Ca-rich crystals when adding the same amount of MgO and CaO during cooling. The effective slagging operating temperature range decrease from 217 degrees C for the slag with a 0:4 MgO/CaO ratio to 44 degrees C for the slag with a 4:0 MgO/CaO ratio with the MgO/CaO ratio increase. The slags with 2:2 and 1:3 MgO/CaO ratios show similar effective slagging operating temperature range, Tp25 and the temperature corresponding to the viscosity of 2 Pa.s. However, compared with the slag with a 1:3 MgO/CaO ratio, the crystallization ratio and rate of slag with a 2:2 MgO/CaO ratio are lower within lower temperature range (1300-1200 degrees C), causing its lower critical viscosity temperature and wider actual operating temperature range. Of the five slags, the widest effective slagging operating temperature range and the lowest Tp25 of the slag with a 0:4 MgO/CaO ratio due to its low crystallization ratio, and wider actual operating temperature range of the slag with a 2:2 MgO/CaO ratio make the two slags suitable for slag discharge of EFB gasifier. (c) 2022 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.