A mechanically fluidized reactor (MFR) is a novel and compact reactor used for biomass pyrolysis. Endothermic biomass pyrolysis requires heat provided from the wall of the MFR. Meanwhile, mixing with a vertical stirrer helps achieve effective heat transfer from the wall to the bed. Here, the heat transfer characteristics between the wall of a 1.0-L MFR and its bed of mechanically fluidized sand particles were studied. An induction heating system was used to heat the wall, while a vertical blade stirrer was used for mixing. Heat transfer measurements were carried out using silica sand particles, having three average Sauter mean diameters: 190, 300, and 600 μm. The overall wall-to-bed heat transfer coefficients were estimated using temperature measurements taken during continuous injection of water onto the fluidized bed. The overall heat transfer coefficient for bed temperatures of 500–700 °C increased as particle size increased or superficial velocity of the vaporized liquid increased. Effect of impeller rotation speed also was investigated. Typically, the overall heat transfer coefficient increased as rotation speed increased. The wall-to-bed heat transfer coefficients obtained in this study are comparable to estimates from traditional bubbling fluidized beds, even at vapor velocities below the minimum fluidization velocity.

机械流化反应器（MFR）是用于生物质热解的新型紧凑型反应器。吸热的生物质热解需要MFR壁提供的热量。同时，与立式搅拌器混合有助于实现从壁到床的有效传热。在此，研究了1.0升MFR的壁与其机械流化的沙粒床之间的传热特性。使用感应加热系统加热壁，同时使用立式叶片搅拌器进行混合。使用具有三个Sauter平均平均直径：190、300和600μm的硅砂颗粒进行传热测量。使用将水连续注入流化床期间获得的温度测量值估算壁到床的总传热系数。随着颗粒大小的增加或汽化液体的表面速度的增加，床层温度在500-700°C时的总传热系数也随之增加。还研究了叶轮转速的影响。通常，总的传热系数随着转速的增加而增加。即使蒸汽速度低于最小流化速度，在这项研究中获得的壁-床传热系数也可与传统起泡流化床的估算值相媲美。