文献类型：期刊文献

英文题名：Exploring Influence of MgO/Na2O on Melting Characteristics and Viscosity-Temperature Characteristics of Coal Slags Under Entrained Flow Gasification Condition

作者：Li, Meng[1,2];Xu, Jianliang[2];Chen, Xueli[2];Wu, Hao[2]

机构：[1]Shandong Jiaotong Univ, Sch Automot Engn, Jinan, Shandong, Peoples R China;[2]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai, Peoples R China

年份：2026

外文期刊名：ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING

收录：;EI(收录号：20262921135617);Scopus(收录号：2-s2.0-105044806016);WOS:【SCI-EXPANDED(收录号:WOS:001822332800001)】；

基金：This research was financially supported by the National Natural Science Foundation of China (21878082), the Natural Science Foundation of Shandong Province, China (ZR2025QC2205Z), and the Key Research and Development Program of Autonomous Region (2023B01013).

语种：英文

外文关键词：melting characteristics; slag discharge; viscosity-temperature characteristics; Zhundong coal; MgO/Na2O

摘要：Characteristics of high alkali in Zhundong coal ash may cause ash-related slag discharge problems at entrained-flow-bed (EFB) gasifier. In this study, through exploring melting characteristics and viscosity-temperature characteristics, it is found that MN05, MN14, and MN23 show low FTs (< 1160 degrees C). Subsequently, with MgO/Na2O ratio increasing, the crystals transformed into Mg-rich crystals melted at higher temperature, and some SiO2 require higher temperatures to participate in new crystals formation, which causes FT increasing. MN23 shows the best viscosity-temperature characteristics due to synergism of MgO and Na2O. For slag discharge from EFB gasifiers, MN05, MN14, and MN23 are suitable due to low T-cv and wide Delta T. With MgO/Na2O ratio increasing, the initial crystallization temperature increases because of stronger polarization ability of Mg2+ than Na+, and crystal size shows an increasing trend. The viscosity of molten liquid slag decreases due to decrease in polymerization degree with MgO/Na2O ratio increasing, and molar ionic potential (alpha) is linearly positively correlated with eta(1530 degrees C). For MN05 and MN14, T-cv appears before the initial crystallization temperature, suggesting that the viscosity increase may be related to liquid-network evolution and the increase in bulk melt viscosity before crystallization becomes evident. MN32, MN41, and MN50 show high T-cv due to crystallization. The obvious viscosity increase of MN23 may be influenced by crystallization and polymerization degree changes.