The effect of oil shale semi-coke (SC) on the mineralogy and morphology of the ash deposited on probes situated in the flue path of a circulating fluidized bed (CFB) which burns Zhundong lignite (ZD) was investigated. 10 wt% or 20 wt% SC was added to ZD, which were then combusted in the CFB furnace at 950°C. Two probes with vertical and horizontal orientations were installed in the flue duct to simulate ash deposition. Both windward and leeward ash deposits on probes (P₁W, P₁L, P₂W and P₂L) were analyzed by using a scanning electron microscopy with energy dispersive X-ray (SEM-EDX), X-ray diffraction (XRD), an inductively coupled plasma optical emission spectrometry ICP-OES, and a particle size analyzer. When ZD was burned alone, the P₁W deposit was comprised of agglomerates (< 30 µm) enriched in CaSO₄ and Na₂SiO₃, incurring significant sintering. The P₁L and P₂W deposits, however, were of both discrete and agglomerated particles in similar mineral phases but with coarser sizes. The P₂L deposit was mainly fine ash particles where Na₂SiO₃ and Na₂SO₄ were absent. As SC was added, the agglomerates in both P₁W and P₁L decreased. Moreover, SiO₂ and Ca/Na aluminosilicates dominated the mineral phases whereas Na₂SiO₃ and Na₂SO₄ disappeared, showing a decrease in deposit stickiness. Likewise, the P₂W deposit was found less spread on the probe, decreasing its deposition propensity. Na-bearing minerals turned into (Na, K)(Si₃Al)O₈ and (Ca, Na)(Si, Al)₄O₈ in the P₂W deposit. Moreover, Na in the deposits decreased from 32 mg/g to less than 15 mg/g as SC presented. The addition of SC would therefore help alleviate the propensity of ash deposition in the flue path in the CFB combustion of ZD.

研究了油页岩半焦（SC）对沉积在燃烧准东褐煤（ZD）的循环流化床（CFB）烟道中的探针上的灰分的矿物学和形态的影响。将10重量％或20重量％的SC添加到ZD中，然后将其在CFB炉中在950℃下燃烧。在烟道中安装了两个垂直和水平方向的探针，以模拟灰分沉积。迎风和背风灰均沉积在探头上（P ₁ W，P ₁ L，P ₂ W和P ₂L）通过使用具有能量色散X射线（SEM-EDX），X射线衍射（XRD），电感耦合等离子体发射光谱ICP-OES和粒度分析仪的扫描电子显微镜进行分析。当ZD单独燃烧时，P ₁ W沉积物由富含CaSO ₄和Na ₂ SiO ₃的团聚体（<30 µm）组成，从而引起大量烧结。然而，P ₁ L和P ₂ W矿床在相似的矿物相中既具有离散颗粒又具有团聚颗粒，但粒度较大。P ₂ L沉积物主要为细灰粒，其中Na ₂ SiO ₃和Na ₂ SO ₄缺席。当添加SC时，P ₁ W和P ₁ L中的团聚体都减少。此外，SiO ₂和Ca / Na铝硅酸盐占主导的矿物相，而Na ₂ SiO ₃和Na ₂ SO ₄消失，表明沉积物粘性降低。同样，发现P ₂ W沉积物在探针上的扩散较少，从而降低了其沉积倾向。P _2中的含钠矿物变成（Na，K）（Si ₃ Al）O ₈和（Ca，Na）（Si，Al）₄ O ₈W存款。此外，沉积物中的Na含量从SC的32 mg / g降至低于15 mg / g。因此，添加SC将有助于减轻ZD CFB燃烧过程中烟道中灰烬的沉积倾向。