In chemical looping combustion (CLC), the chosen oxygen carrier’s (OC) reactivity maintenance and attrition propensity play key roles in determining its lifetime in such systems. Jet and cyclonic attrition are two main mechanisms of attrition in CLC systems, which typically use fluidized beds and cyclones. In contrast to standardized tests, that assess attrition characteristics under ambient and non-reacting conditions, a realistic evaluation must include the behavior under relevant high temperatures and cyclic oxidation-reduction. In this study, separate jet and cyclonic attrition test units were constructed to investigate the effects of temperature, fuel gas concentration and velocity on the performance of ilmenite, a natural ore-based OC in CLC. Testing showed that thermal and chemical effects were crucial to accurately determine the performance of ilmenite. For experiments conducted between 820°C and 970°C, the intermediate temperature of 895°C provided the best balance between high reactivity and material durability. Additionally, fuel gas concentration affected particle morphology evolution. Iron migration to the surface of the ilmenite particle was enhanced at higher fuel gas concentrations and resulted in reduced attrition rate, presumably due to sintering of the more highly reduced enriched iron phase on the particle surface. The laboratory jet and cyclonic attrition evaluation test units tested in this study can be used to investigate multiple parameters relevant for OC performance, including the degree of reduction, oxygen carrying capacity, attrition resistance, agglomeration, and optimum material operability conditions, as well as to extrapolate test data to determine OC replacement costs in a commercial CLC system.

在化学循环燃烧（CLC）中，所选氧气载体（OC）的反应性维持和磨损倾向在确定此类系统的寿命中起着关键作用。射流和旋流磨损是CLC系统中的两种主要磨损机理，通常使用流化床和旋风分离器。与评估在环境和非反应条件下的磨损特性的标准化测试相反，现实的评估必须包括相关高温下的行为和循环氧化还原。在这项研究中，分别建造了喷气和旋流磨损试验装置，以研究温度，燃料气体浓度和速度对钛铁矿性能的影响，钛铁矿是CLC中基于天然矿石的OC。测试表明，热和化学作用对于准确确定钛铁矿的性能至关重要。对于在820°C至970°C之间进行的实验，895°C的中间温度在高反应性和材料耐用性之间提供了最佳平衡。另外，燃料气体浓度影响颗粒形态演变。在较高的燃料气体浓度下，铁向钛铁矿颗粒表面的迁移得以增强，并导致磨损率降低，这大概是由于在颗粒表面上还原度更高的富集铁相的烧结所致。在这项研究中测试的实验室射流和气旋磨损评估测试装置可用于研究与OC性能有关的多个参数，包括还原度，载氧量，耐磨耗性，结块，