Abstract The paper presents the ash deposition behavior during pressurized oxy-fuel fluidized bed combustion (POFBC) of Zhundong coal at 0.3 MPa, which has never been reported before. Ash deposits collected from different positions (windward, leeward and vertical sides) of the probe under different atmospheres were investigated in detail. The results showed that the inside deposits, i.e. the initial deposit layers, on the different positions shared the similar composition and morphology. However, the atmosphere had a significant impact on the ash deposition behavior. The inside deposits have more regular spheres and larger size under 30% O2/70% CO2 condition than those from 21% O2/79% N2 and 21% O2/79% CO2 combustion, probably due to the intensive submicron particle coagulation. Furthermore, the particles contained in the inside deposits had higher Fe and Cl in 30% O2/70% CO2 combustion compared with that in the other two combustion modes. However, the content of S in the deposits was the highest under 21% O2/79% CO2 condition, which may be attributed to the fact that high CO2 partial pressure strengthens self-desulfurization ability of ash. In addition, S and Si contributed significantly to the compositions of the inside deposits.

中文翻译：

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准东煤在实验室流化床加压富氧燃烧过程中的灰沉积

摘要 本文介绍了准东煤在0.3 MPa压力下加压富氧流化床燃烧（POFBC）过程中的灰沉积行为，这是以前从未报道过的。详细研究了在不同大气条件下从探头不同位置（迎风侧、背风侧和垂直侧）收集的灰烬沉积物。结果表明，不同位置的内部沉积物，即初始沉积层具有相似的组成和形态。然而，大气对灰沉积行为有显着影响。与 21% O2/79% N2 和 21% O2/79% CO2 燃烧相比，内部沉积物在 30% O2/70% CO2 条件下具有更规则的球体和更大的尺寸，这可能是由于亚微米颗粒的强烈凝聚所致。此外，与其他两种燃烧模式相比，在30% O2/70% CO2 燃烧中，内部沉积物中包含的颗粒具有更高的Fe 和Cl。但沉积物中S含量在21%O2/79%CO2条件下最高，这可能是由于高CO2分压增强了灰分的自脱硫能力。此外，S 和 Si 对内部沉积物的组成有显着影响。