Prediction of ash particle adherence to walls, melting, and flow properties are important for successful operation of slagging entrained flow gasifiers. In the present study, silicon-rich reed canary grass was gasified at 1000 and 1200 °C with solid KHCO₃ added at 0, 1, or 5 wt % to evaluate the impact and efficiency of the dry mixed additive on slag properties. The fuel particles collided with an angled flat impact probe inside the hot reactor, constructed to allow for particle image velocimetry close to the surface of the probe. Ash deposit layer buildup was studied in situ as well as ash particle shape, size, and velocity as they impacted on the probe surface. The ash deposits were analyzed using scanning electron microscopy–energy-dispersive X-ray spectroscopy, giving detailed information on morphology and elemental composition. Results were compared to thermodynamic equilibrium calculations for phase composition and viscosity. The experimental observations (slag melting, flow properties, and composition) were in good qualitative agreement with the theoretical predictions. Accordingly, at 1000 °C, no or partial melts were observed depending upon the potassium/silicon ratio; instead, high amounts of additive and a temperature of at least 1200 °C were needed to create a flowing melt.

中文翻译：

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气流床气化过程中的炉渣形成：含KHCO ₃添加剂的富含硅的草燃料

灰烬颗粒对壁的附着，熔化和流动特性的预测对于排渣夹带流化气化炉的成功运行很重要。在本研究中，将富含硅的芦苇金丝雀草在1000和1200°C下气化，并以0、1或5 wt％的量添加固体KHCO ₃来评估干混添加剂对矿渣性能的影响和效率。燃料颗粒在热反应器内与一个成角度的扁平冲击探针相撞，该探针构造成允许接近探针表面的颗粒图像测速法。灰沉积层堆积的原位研究以及它们影响探针表面的灰分形状，大小和速度。使用扫描电子显微镜–能量色散X射线光谱仪分析了灰烬沉积物，提供了有关形态和元素组成的详细信息。将结果与热力学平衡计算的相组成和粘度进行比较。实验观察（熔渣熔化，流动特性和组成）与理论预测在质量上吻合良好。因此，在1000℃下，根据钾/硅的比例，没有观察到或有部分熔融。相反，需要大量的添加剂和至少1200°C的温度才能形成流动的熔体。