Torrefied biomass is characterized as a high-quality renewable energy commodity that can substitute fossil fuels. Combined torrefaction and pelletization are used to increase the value of biomass by improving its handling and fuel properties. The aim of this study is to present the influence of pelletization process on torrefaction in a pilot-scale unit. Above that, two process modes were assessed, and the properties of the torrefied and pelletized biomass and vice versa were studied. Mode I involved torrefaction prior pelletization. In mode II, on the contrary, the waste biomass was first pelletized and then torrefied. Analysis of mechanical parameters and chemical composition was therefore used to determine which of the modes was more advantageous. The results showed that within both modes it is evident that a higher torrefaction temperature caused wettability index decrease with a simultaneous higher heating value increase. Pellets produced in mode I showed better calorific values, however worse mechanical properties particularly durability.

烘焙生物质被描述为可以替代化石燃料的优质可再生能源商品。联合烘焙和造粒用于通过改善其处理和燃料特性来增加生物质的价值。本研究的目的是介绍造粒过程对中试规模单元中烘焙的影响。在此之上，评估了两种工艺模式，并研究了烘焙和颗粒化生物质的特性，反之亦然。模式 I 涉及在造粒之前进行烘焙。相反，在模式 II 中，废弃生物质首先被造粒，然后被烘干。因此，使用机械参数和化学成分的分析来确定哪种模式更有利。结果表明，在两种模式下，显然较高的烘焙温度会导致润湿性指数降低，同时较高的热值增加。以模式 I 生产的颗粒显示出更好的热值，但机械性能较差，特别是耐久性。