文献类型：期刊文献

英文题名：Synergistic effects and mechanism of the ternary flux system Fe2O3-CaO-MgO on the coal ash slag fluidity

作者：Wu, Hao[1];Wang, Jiajian[1];Liu, Xia[1];Cao, Xi[1];Guo, Qinghua[1];Yu, Guangsuo[1,2]

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：343

外文期刊名：FUEL

收录：;EI(收录号：20231013682337);WOS:【SCI-EXPANDED(收录号:WOS:001006880700001)】；

基金：The authors gratefully acknowledge the financial support from Na-tional Natural Science Foundation of China (22108080) .

语种：英文

外文关键词：Synergistic effects; Ternary flux; Slag fluidity; Viscosity; Crystallization behavior

摘要：Basic oxides are usually widespread in low-rank coals and cause many ash-related problems in gasification ap-plications. In this paper, the synergistic effects of the ternary flux system of Fe2O3-CaO-MgO in lowering the ash fusion temperature and improving the viscosity-temperature characteristics were verified by testing the prop-erties of samples with different Fe2O3/(CaO + MgO) ratios. The flow temperatures and temperatures of the critical viscosity decreased and then increased with the decrease of Fe2O3/(CaO + MgO) ratio and reached the lowest point when the iron oxide and alkaline earth metal oxide (CaO, MgO) contents were close to each other. From the perspective of mineral transformation, the formation of low melting point ferroan spinel and the eutectic between anorthite and ferroan spinel are the main mechanisms of synergism. No severe crystallization was observed in the iron-rich slags because Fe2+ could reduce the crystallization tendency. As CaO and MgO dominated the basic oxides, a CaO/MgO ratio of 4:6 effectively limited the crystallization and lower the tem-perature of critical viscosity (TCV). Thus, when regulating the coal ash fluidity, the content of iron oxide and the ratio between CaO and MgO should be consciously balanced to meet the requirements of the gasifier for slag removal.