瑞典查尔莫斯理工大学Victor Purnomo小组的一项最新研究，提出了多氧化态铁基氧载体粒径和形状分析的新方法。相关论文于2024年2月1日发表于国际顶尖学术期刊《颗粒学报》杂志上。

化学环化技术的关键问题之一在于其床层材料——氧载体。氧载体的粒度分析很重要，因为在流化床中，物料只能在特定的粒度范围内工作。虽然已经报道了氧载体材料的有利尺寸范围，但没有一项已发表的研究详细分析了氧载体的粒径和形状。此外，氧载体的氧化程度对这些性能的影响也没有考虑。

该研究使用动态图像分析(DIA)，报道了五种铁基氧载体(一种天然矿石、一种合成材料和三种残渣产品)在不同氧化度下的粒度和形状分析。在流化床间歇反应器中制备了不同质量转化率的氧载体。利用Camsizer仪器对载氧颗粒的尺寸分布、球度和长径比进行了实验研究。

结果表明，动态图像分析方法能够成功地分析其氧载体的粒径和形状，并具有令人满意的比较精度。所研究材料的氧化态似乎只在很小程度上影响氧载体的粒度和形状。然而，暴露于流化床反应器中的氧化还原循环，可能会改变大多数氧载体的粒度和形状。

附：英文原文

Title: New approach for particle size and shape analysis of iron-based oxygen carriers at multiple oxidation states

Author: anonymous

Issue&Volume: 2024/02/01

Abstract: One of the crucial issues in the chemical looping technology lies in its bed material: the oxygen carrier. Particle size analysis of an oxygen carrier is important since in a fluidized bed the material can only work well within a specific size range. While the favorable size ranges for oxygen carrier materials have already been reported, none of the published studies has analyzed the particle size and shape of oxygen carriers in detail. Furthermore, the effect of oxygen carriers’ oxidation degree on such properties has not been considered either. This study aimed to report the particle size and shape analysis of five iron-based oxygen carriers, one natural ore, one synthetic material, and three residue products, at different oxidation degrees using dynamic image analysis (DIA). The oxygen carriers were prepared at different mass conversion degrees in a fluidized bed batch reactor. The size distribution, sphericity, and aspect ratio of the oxygen carrier particles were examined experimentally using a Camsizer instrument. Our results show that the DIA method was successfully able to analyze the particle size and shape of our oxygen carriers with satisfying accuracy for comparison. The oxidation state of the investigated materials seems to only affect the particle size and shape of oxygen carriers to a minor extent. However, exposures to redox cycles in a fluidized bed reactor may alter the particle size and shape of most oxygen carriers.

DOI: 10.1016/j.partic.2024.01.010

Source: https://www.sciencedirect.com/science/article/pii/S1674200124000178