Ash fusion characteristics of iron-rich coal in Xinjiang under different atmospheres and the influence mechanism of adding red mud and pipeline scale
Ash fusion characteristics of iron-rich coal in Xinjiang under different atmospheres and the influence mechanism of adding red mud and pipeline scale
复制标题
DOI：
10.1002/apj.3012
复制
发表时间：
2023-11-28
影响因子：
1.8
通讯作者：
Bao，Yahan
中科院分区：
文献类型：
--
作者：
Lv，Junxin;Wang，Yonggang;Bao，Yahan
为了实现富铁煤的高效利用，有必要对灰熔融特性及其调控机理进行深入研究。本文首先对新疆富铁煤在不同气氛下的灰熔融温度进行了试验研究。选用华锦铝业赤泥(HJ)和黑水垢(GDG)作为添加剂。在相同的灰化程序后，将两种添加剂按不同比例与富铁灰混合，实现对灰化学成分的调节，改善灰的熔融特性。在全自动灰熔点分析仪上进行了灰熔融温度(AFT)实验，制备了不同温度下的高温灰熔渣。用X射线衍射仪对灰渣的物相进行了表征，并与Factsage模拟计算结果进行了比较，揭示了灰渣熔融温度的影响机理。结果表明，ZC富铁灰在氧化气氛和弱还原气氛下的熔融温度有显著差异。与氧化气氛相比，在弱还原条件下，ZC富铁灰的四个特征温度显著降低，相差约150℃。赤泥和管道垢的加入不同程度地提高了ZC灰的熔融温度。掺入HJ灰对ZC灰的变形温度影响不大，而掺入不同比例的HJ灰显著提高了ZC灰的流动温度。当HJ灰的掺量为40%时，ZC灰的流动温度FT升高最为明显，约为50℃。HJ灰和GDG灰的加入会导致含铁尖晶石含量的增加，从而提高灰的流动温度。
To realize the high‐efficiency utilization of iron‐rich coal, it is necessary to conduct in‐depth research on the ash fusion characteristics and regulation mechanism. In this paper, the ash fusion temperature test of iron‐rich coal in Xinjiang (ZC) under different atmospheres was first carried out. Then, red mud (HJ) from Huajin Aluminum Industry and black water pipe scale (GDG) were selected as the additives. After the same ashing procedure, the two additives were mixed with iron‐rich coal ash in different proportions to realize the regulation of the chemical composition of the coal ash to improve the ash fusion characteristic. The ash fusion temperature (AFT) experiment was carried out in the automatic ash melting point analyzer, and high‐temperature ash melting slags at different temperatures were prepared. The mineral phases of coal ash and slag were characterized by XRD and compared with the Factsage simulation calculation results to reveal the influence mechanism of coal ash fusion temperature. The result shows that the fusion temperature of ZC iron‐rich coal ash is significantly different between oxidizing atmosphere and weak reducing atmosphere. Compared with the oxidizing atmosphere, the four characteristic temperatures of ZC iron‐rich coal ash are significantly lower under weak reducing conditions, and the difference is about 150°C. The addition of red mud and pipeline scale increased the fusion temperature of ZC coal ash to varying degrees. The addition of HJ ash has little effect on the deformation temperature of ZC coal ash, while the addition of different proportions of HJ ash significantly increases the flow temperature of ZC coal ash. When the addition ratio of HJ ash is 40%, the flow temperature FT of ZC coal ash increases most obviously, which is about 50°C. The addition of HJ ash and GDG ash will lead to an increase in the content of iron‐containing spinel, thereby increasing the ash flow temperature.