The aim of this work was to experimentally study the oxidative torrefaction of sunflower husk pellets in a kaolin layer. The kaolin layer was used to limit oxygen access to the biomass to prevent it from self-ignition. The changes in mass yield, volatiles, ash content, high calorific value (HHV), hydrophobicity, and morphology of the biomass were investigated at torrefaction temperatures 240, 260, and 280 °C, process durations 30–60 min, and kaolin layer heights 3–5 cm. The Van Krevelen diagram and the CHO index based on atomic C, H, and O data were also used for explanation. As a result of oxidative torrefaction in the kaolin layer, the atomic O/C and H/C ratios decreased and the sunflower husk position shifted towards peat. During torrefaction at 260 °C for 1 h (kaolin layer height of 3 cm) the O/C decreased by 26.9% and the H/C by 18.8%. Reducing the height of kaolin layer, as well as increasing the temperature and time of torrefaction, led to a decrease in mass yield and an increase in ash content. Torrefaction increased the FC/VM ratio from 50 to 225%, which improved the fuel properties of the biomass. A 16.5% increase in HHV was achieved compared to untreated sunflower husk. As the torrefaction intensity increased, drier fuel was formed, the moisture absorption of which decreased from 213 to 25.8%.

这项工作的目的是通过实验研究高岭土层中的葵花壳颗粒的氧化焙干。高岭土层用于限制氧气进入生物质，以防止其自燃。研究了在240、260和280°C的烘烤温度，30-60分钟的过程持续时间和高岭土层高度下，生物质的产量，挥发物，灰分，高热值（HHV），疏水性和形态的变化。 3-5厘米。Van Krevelen图和基于原子C，H和O数据的CHO索引也用于说明。由于高岭土层中的氧化焙干，原子的O / C和H / C比值降低，葵花壳的位置移向泥炭。在260°C烘烤1小时（高岭土层高度为3 cm）期间，O / C降低26.9％，H / C降低18.8％。降低高岭土层的高度，以及增加焙烧的温度和时间，导致大量产率的降低和灰分含量的增加。烘焙将FC / VM比从50％提高到225％，从而改善了生物质的燃料特性。与未处理的葵花皮相比，HHV增加了16.5％。随着烘焙强度的增加，形成了干燥的燃料，其吸湿率从213下降至25.8％。