The solids circulation behaviour in a circulating fluidized bed with a concentric annular feeder (a-CFB) was investigated, with a focus on the effect of the entrance structure design and gas flow rates in the riser and the annular region on the solids circulation rate. The pressure drop in the annular region was found to be strongly correlated to the entrance region configuration and solids circulation rate for a given type of particles. Based on a systematic experimental study of the riser bottom configuration and operating parameters on solids circulation rate of the a-CFB, a new method was proposed for in-situ monitoring solids circulation rate based on the measurement of pressure drop in the annular region of the a-CFB.

中文翻译：

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具有同心环形进料机构的循环流化床中的固体循环行为

研究了具有同心环形进料器（a-CFB）的循环流化床中的固体循环行为，重点研究了入口结构设计以及提升管和环形区域中的气体流速对固体循环速率的影响。发现环形区域的压降与给定类型颗粒的入口区域配置和固体循环速率密切相关。在对立管底部结构和运行参数对 a-CFB 固体循环率的系统实验研究的基础上，提出了一种基于测量塔环区压降的现场监测固体循环率的新方法。 a-CFB。