Chemical-looping combustion (CLC) in packed-fluidized bed reactor was investigated. Experiments were carried out in a cylindrical laboratory-scale bubbling fluidized-bed reactor with an inner diameter of 78 mm and a hight of 1.27 m. Ilmenite concentrate particles in the size range 90–212 μm was used as oxygen carrying fluidizing solid. Two different types of random packings were used: aluminum silicate balls (ASB) with a diameter of 12.7 mm and bulk density of 1439 kg/m³ and 25 mm stainless steel thread saddles (RMSR) with bulk density of 204 kg/m³. The superficial gas velocity was 0.3 m/s. The fuels were CO and CH₄. The bed temperature was 840 °C for CO and 940 °C for CH₄. The height of the packed bed was kept constant at 1 m. The fluidized oxygen carrier bed height was varied from 2 cm to 40 cm. Results showed that fuel conversion in packed-fluidized beds is highly dependent on oxygen carrier bed height and the nature of the packing. Packed-fluidized beds with RMSR packing resulted in a significant improvement in fuel conversion, compared to a bubbling bed with no packing. With 30–40 cm bed height, CO conversion was ≈99.5% with RMSR packing and 91–96% without packing. The corresponding numbers for CH₄ were ≈84% and ≈78%. Further, the RMSR packing has very high void factor (0.96). Thus, it should have limited effects on particle inventory, pressure drop and throughput. The most likely mechanism for improved fuel conversion is improved gas-solid mass transfer due to be reduced bubble size. The ASB packing has low void factor (0.43) and provided mixed results with respect to fuel conversion.

研究了填充流化床反应器中的化学回路燃烧（CLC）。实验是在内径为 78 mm、高度为 1.27 m 的圆柱形实验室规模鼓泡流化床反应器中进行的。尺寸范围为 90-212 μm 的钛铁矿精矿颗粒用作载氧流化固体。使用了两种不同类型的随机填料：直径为 12.7 毫米、堆积密度为 1439 千克/米^{3 的}硅酸铝球 (ASB ) 和堆积密度为 204 千克/米^{3 的}25 毫米不锈钢螺纹鞍座 (RMSR) 。表观气体速度为0.3m/s。燃料是CO和CH ₄。CO 的床温为 840 °C，CH ₄的床温为 940 °C. 填充床的高度保持恒定在 1 m。流化氧载体床高度从2厘米到40厘米不等。结果表明，填充流化床中的燃料转化高度依赖于载氧体床的高度和填料的性质。与没有填料的鼓泡床相比，带有 RMSR 填料的填料流化床显着提高了燃料转化率。对于 30-40 cm 床高，使用 RMSR 填料时 CO 转化率约为 99.5%，无填料时为 91-96%。CH ₄对应的编号≈84% 和 ≈78%。此外，RMSR 填料具有非常高的空隙系数 (0.96)。因此，它对颗粒库存、压降和吞吐量的影响应该有限。改进燃料转化的最可能机制是由于气泡尺寸减小而改进了气固传质。ASB 填料具有低空隙系数 (0.43)，并且在燃料转化方面提供了混合结果。