Coal-fired chemical looping combustion (CLC) is a promising technology with inherent CO₂ separation with a low energy penalty. One of challenges for coal-fired CLC is that char particles with slow gasification kinetics can be easily transferred into the air reactor (AR) by circulated oxygen carrier (OC), thereby decreasing the carbon capture efficiency. An annular carbon stripper (CS) was proposed to efficiently separate the char particles from the mixture of OC and char. A hot system of 10 kW_th CLC unit coupled with an annular CS was designed, built, and operated in order to investigate the separation performance of an annular CS at high temperature (850-950 °C). Vietnamese ilmenite was used as OC to burn Shenfu bituminous coal. The system achieved a stable solid circulation at a high temperature with steady coal feeding, and total operation reached 100 h with a thermal input of 3-5 kW_th. A 90%-95% char separation efficiency was achieved by the annular CS in various tests, and the carbon capture efficiency reached 95% at 950 °C. A special particle sampling device was designed to collect solid particles from the dense phase of CLC reactor during the continuous operation stage. It was found that the char mass faction in the FR dense phase was 0.45%-5.5% and a fraction of char adhered to the ilmenite surface, which was difficult to separate by the annular CS. Additionally, the sintering and agglomeration of ilmenite was not observed during continuous operation at 850-950 °C. Furthermore, through extrapolating experimental results, it is predicted that 90% carbon capture efficiency can be achieved by using this new annular CS in a scaled-up CLC system.

燃煤化学循环燃烧（CLC）是一种很有前途的技术，具有固有的CO ₂分离功能，并且能耗低。燃煤CLC的挑战之一是，气化动力学较慢的炭颗粒很容易通过循环的氧气载体（OC）转移到空气反应器（AR）中，从而降低了碳捕获效率。提出了一种环形碳汽提塔（CS），以有效地将炭颗粒从OC和炭的混合物中分离出来。10千瓦的热系统_日设计，制造和运行带有环形CS的CLC单元，以研究高温（850-950°C）下环形CS的分离性能。越南钛铁矿被用作OC燃烧神府烟煤。该系统在高温下实现了稳定的固体循环，并有稳定的煤供料，在3-5 kW _th的热输入下，总运行时间达到了100 h。在各种测试中，通过环形CS达到90％-95％的焦炭分离效率，并且在950°C时碳捕获效率达到95％。设计了一种特殊的颗粒采样装置，以在连续操作阶段从CLC反应器的密相中收集固体颗粒。发现在FR致密相中的焦炭成分为0.45％-5.5％，并且一部分焦炭附着在钛铁矿表面上，这难以通过环状CS分离。另外，在850-950℃的连续操作过程中未观察到钛铁矿的烧结和附聚。此外，通过外推实验结果，可以预测，通过在按比例放大的CLC系统中使用这种新的环形CS，可以实现90％的碳捕获效率。