Li Ping, Kan Haoyong, Chen Cai, Wu Jianjun, Zhang Yixin, Guo Fanhui
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China.
State Key Laboratory of Coal Efficient Utilization and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China.
ACS Omega. 2024 May 8;9(20):22313-22324. doi: 10.1021/acsomega.4c01678. eCollection 2024 May 21.
The entrained-flow gasifier has a better adaptability to various coals. The composition of coal ash is an important factor affecting the high-temperature flow characteristics of molten slag. Based on the SiO-AlO-CaO/NaO ternary phase diagram, the high-temperature molten flow characteristics of slag located in the main phase regions of feldspar, melilite, diopside, and mullite were investigated by experiments and thermodynamic software calculations. The results indicate that the melting process of ash in the three phase zones is influenced by different factors. It was discovered by infrared spectroscopy analysis that the slag was dominated by SiO ion clusters in the feldspar region. The slag in the diopside region had a slightly higher proportion of simple silicate ion clusters than the slag in the feldspar region, resulting in better fluidity. This is significant for revealing the mechanism of coal ash melting and flowing and guiding industrial coal blending.
气流床气化炉对各种煤种具有更好的适应性。煤灰成分是影响熔渣高温流动特性的重要因素。基于SiO-AlO-CaO/NaO三元相图，通过实验和热力学软件计算研究了位于长石、黄长石、透辉石和莫来石主相区的熔渣高温熔体流动特性。结果表明，三个相区中灰的熔化过程受不同因素影响。通过红外光谱分析发现，长石区域的熔渣以SiO离子簇为主。透辉石区域的熔渣比长石区域的熔渣具有稍高比例的单硅酸盐离子簇，因而流动性更好。这对于揭示煤灰熔化和流动机理以及指导工业配煤具有重要意义。
