In the combustion process of Zhundong coal, many factors had obvious influence on slagging process. In this paper, the influence of particle system on slag formation and shedding process was evaluated. Two slags were sampled at two CFBBs super heaters which temperatures were similar and the ash particles size and concentration were different. The collected slags were separated, and the inner layer was analyzed by XRF, XRD, and Nano-CT. The results suggested that the area ratio of particles smaller than 2 μm to the region area was above 80% in each region, indicating that the inner layer was dominated by fine particles. Furthermore, the proportion of particles decreased in each region of two slags with the increase of particle size. The influence of particle system on the slag formation and shedding process was proposed. The accumulation of small particles was the cause of slag formation, while large particles had great influence on slag shedding. The presence of large particles increased the porosity and reduced the contact area between particles, the binding force between the particles was weaker than that between particles and tubes. Therefore, the fracture location of two slags was different, which made the internal surface presented different appearances.

在准东煤的燃烧过程中，许多因素对结渣过程有明显的影响。在本文中，评价了颗粒系统对渣形成和脱落过程的影响。在两个温度相似且灰分粒度和浓度不同的 CFBB 过热器中对两种炉渣进行取样。分离收集到的炉渣，并通过 XRF、XRD 和 Nano-CT 分析内层。结果表明，各区域小于2 μm的颗粒面积占区域面积的比例均在80%以上，表明内层以细颗粒为主。此外，随着粒径的增加，两种炉渣各区域的颗粒比例均有所降低。提出了颗粒体系对熔渣形成和脱落过程的影响。小颗粒的堆积是造渣的原因，而大颗粒对出渣影响很大。大颗粒的存在增加了孔隙率并减少了颗粒之间的接触面积，颗粒之间的结合力弱于颗粒与管之间的结合力。因此，两种炉渣的断裂位置不同，使内表面呈现不同的外观。