Chemical-Looping Combustion (CLC) is a promising technology for performing CO₂ capture in combustion processes at low cost and with lower energy consumption. Fuel conversion modelling assists in optimizing and predicting the performance of the CLC process under different operating conditions. For this work, the combustion of natural gas was modelled using a CaMnO₃-type perovskite as oxygen-carrier and taking into consideration the processes of fluid dynamics and reaction kinetics involved in fuel conversion. The CLC model was validated against experimental results obtained from the 120 kW_th CLC unit at the Vienna University of Technology (TUV). Good agreement between experimental and model predictions of fuel conversion was found when the temperature, pressure drop, solids circulation rate and fuel flow were varied. Model predictions showed that oxygen transfer by means of the gas–solid reaction of the fuel with the oxygen-carrier was relevant throughout the entire fuel-reactor. However, complete combustion could be only achieved under operating conditions where the process of Chemical-Looping assisted by Oxygen Uncoupling (CLaOU) became dominant, i.e. a relevant fraction of the fuel was burnt with molecular oxygen (O₂) released by the oxygen-carrier. This phenomenon was improved by the design configuration of the 120 kW_th CLC unit at TUV, in which oxidized particles are recirculated to the upper part of the fuel-reactor. Thus, the validated model identified the conditions at which complete combustion can be achieved, demonstrating that it is a powerful tool for the simulation and optimization of the CLC process with the CaMnO₃-type material.

化学循环燃烧（CLC）是一种有前途的技术，可用于以低成本和较低的能耗在燃烧过程中进行CO ₂捕集。燃料转换建模有助于优化和预测在不同工况下的CLC过程的性能。对于这项工作，使用CaMnO ₃型钙钛矿作为氧气载体，并考虑了燃料转化过程中涉及的流体动力学和反应动力学过程，对天然气的燃烧进行了建模。在CLC模型进行了验证对来自120千瓦获得的实验结果_第维也纳工业大学（TUV）的CLC单位。当温度，压降，固体循环速率和燃料流量发生变化时，在燃料转化率的实验和模型预测之间发现了良好的一致性。模型预测表明，通过燃料与氧气载体的气固反应进行的氧气转移在整个燃料反应器中都非常重要。但是，只有在以下条件下才能实现完全燃烧：以氧气解耦（CL a OU）为辅助的化学循环过程占主导地位，即，一部分燃料与氧气释放的分子氧（O ₂）一起燃烧。 -载体。120 kW _th的设计配置改善了这种现象TUV的CLC单元，其中氧化的颗粒再循环到燃料反应器的上部。因此，经过验证的模型确定了可以实现完全燃烧的条件，这表明它是使用CaMnO ₃型材料模拟和优化CLC工艺的强大工具。