Abstract Biomass gasification can be performed in dense phase sand fluidized beds. The proposed model involves Computational Fluid Dynamics Multiphase Particle-In-Cell (CFD-MPPIC) simulations, allowing the evaluation of bubble dynamics and bubble drag correlations. The proposed model accounts for a single bubble injection into a unit loaded with 520-micron sand particles and 2.7 cm x 0.7 cm cylindrical wood pellets. Model development also includes the selection of an adequate number of computational cells, the sizing of the particle-in-cell population, and the cell distribution throughout the column. Predictions of the proposed CFD-MPPIC Model were compared with bubbles measured by the HESC Model ( Torres Brauer et al., 2020 ). This data was obtained in a 0.44 m diameter Plexiglas unit, using CREC-Optiprobes and a spherical cap bubble assumption. It is anticipated that the CFD-MPPIC Model could of significant value for the design of scaled-up biomass units operated under dense phase fluidization conditions.

中文翻译：

---

3D 砂流化床气化炉环境中的单气泡：CFD-MPPIC 模拟

摘要 生物质气化可在密相砂流化床中进行。所提出的模型涉及计算流体动力学多相胞内粒子 (CFD-MPPIC) 模拟，允许评估气泡动力学和气泡阻力相关性。所提出的模型考虑了将单个气泡注入装有 520 微米沙粒和 2.7 厘米 x 0.7 厘米圆柱形木颗粒的装置中。模型开发还包括选择足够数量的计算细胞、细胞内粒子群的大小以及整个柱子中的细胞分布。将所提出的 CFD-MPPIC 模型的预测与 HESC 模型测量的气泡进行了比较（Torres Brauer 等人，2020 年）。该数据是在直径为 0.44 m 的有机玻璃单元中获得的，使用 CREC-Optiprobes 和球冠气泡假设。