In this study, molochite (calcined kaolin) and dolomite with particle sizes (ca.1 mm) similar to those of the sand bed materials of industrial-scale fluidised beds, rather than powders which were normally used by previous studies, were investigated as the bed additives to counter agglomeration with the combustion of wheat straw and miscanthus pellets in a 20 kW_th bubbling fluidised bed combustor under both conventional air combustion and oxy-fuel combustion conditions. The performance of the additives in abating agglomeration was compared to that achieved with another agglomeration countermeasure, lime addition to fuel. Dolomite was found to be superior to molochite in terms of prolonging defluidisation time when firing wheat straw. When firing miscanthus, similar effects of these two bed additives on defluidisation time were observed. The most significant improvement to the combustion performance was achieved by lime addition to fuel for both fuels. Moreover, the oxy-fuel combustion atmosphere showed a great impact on the effectiveness of dolomite but little influence on the effectiveness of molochite. The agglomeration samples were analysed by CAMSIZER, XRD and SEM/EDX and the results were used to derive the possible anti-agglomeration mechanisms of the additives under both air and oxy combustion conditions.

在这项研究中，研究了粒度（约 1 毫米）与工业规模流化床砂床材料相似的莫洛石（煅烧高岭土）和白云石，而不是以前研究中通常使用的粉末，作为床添加剂以对抗 20 kW_日小麦秸秆和芒草颗粒燃烧时的结块鼓泡流化床燃烧器在传统的空气燃烧和氧燃料燃烧条件下。添加剂在减少结块方面的性能与另一种结块对策（向燃料中添加石灰）所达到的性能进行了比较。发现白云石在烧制小麦秸秆时延长脱流时间方面优于莫洛克石。当烧制芒草时，观察到这两种床添加剂对脱流时间的类似影响。燃烧性能的最显着改进是通过在两种燃料的燃料中添加石灰来实现的。此外，氧-燃料燃烧气氛对白云石的有效性影响很大，但对白云石的有效性影响不大。通过CAMSIZER分析团聚样品，