In order to provide basic knowledge for the gasification utilization of low-rank Zhundong (ZD) coal in the process of circulating fluidized bed (CFB), this study focuses on gasification reactivity and ash related agglomeration of ZD coal mainly induced by sodium transformation. Typical ZD coal was pyrolyzed in a horizontal tube reactor by a rapid pyrolysis method at 900 °C. Isothermal and non-isothermal thermogravimetric analyses were used to study the gasification reactivity of ZD char under CO₂ atmosphere. The effect of temperature, ranging from 850 °C to 1050 °C, on isothermal gasification was investigated, and the obtained gasification residues were analyzed to observe microscope morphology and evaluate agglomeration degree. The ternary system relationship of Na₂O–SiO₂–Al₂O₃ at each gasification temperature was calculated with FactSage to compare with the experimental results. The results show that: the gasification reactivity of ZD coal char is greatly affected by the gasification temperature. Higher temperature can increase the average specific gasification rate, thus shorten the reaction time that the carbon conversion reaches equilibrium. The gasification reactivity of coal char is proved to be better at higher temperature. The agglomeration characteristics were also affected by the gasification temperature. There is almost no melting and agglomeration phenomenon for 850 °C gasification residue, while a strong tendency to agglomeration is showed in other samples. However, when the mass fraction of local CaO on the surface of large particles is more than 40%, the melting phenomenon can be alleviated. According to the Na₂O–SiO₂–Al₂O₃ phase diagram, the positions of ZD coal and ZD char are located near the complete Slag-liq region, indicating that using ZD coal and ZD char at the operation temperature of CFB above 950 °C has strong risk of slagging, and a relatively lower gasification temperature, ∼900 °C, is suitable for ZD coal/char gasification.

为了为循环流化床（CFB）过程中低阶准东（ZD）煤的气化利用提供基础知识，本研究侧重于钠转化引起的ZD煤的气化反应性和灰分结块。典型的ZD煤在900℃下通过快速热解方法在卧式管式反应器中热解。用等温和非等温热重分析法研究了ZD炭在CO ₂气氛下的气化反应性。研究了温度在850°C至1050°C之间对等温气化的影响，并对获得的气化残余物进行了分析，以观察显微镜的形貌并评估了聚集度。Na ₂ O-SiO的三元体系关系_{2 –}铝₂ O ₃用FactSage计算每个气化温度下的温度，以与实验结果进行比较。结果表明：ZD煤焦的气化反应性受气化温度的影响很大。较高的温度可以提高平均比气化率，从而缩短碳转化达到平衡的反应时间。事实证明，高温下煤焦的气化反应性更好。团聚特性也受到气化温度的影响。850°C的气化残渣几乎没有熔化和结块现象，而在其他样品中则显示出强烈的结块趋势。然而，当大颗粒表面上的局部CaO的质量分数大于40％时，可以减轻熔融现象。₂ O–SiO ₂ –Al ₂ O ₃相图，ZD煤和ZD炭的位置都位于完整的渣液区域附近，这表明在950°C以上的CFB操作温度下使用ZD煤和ZD炭具有ZD煤/焦炭气化的可能性大，结渣风险高，且气化温度相对较低，约为900°C。