Melina wood torrefied at 260 °C for 60 min was agglomerated with lean grade coal fines into composite briquettes using pitch as binder. Torrefied biomass (3%–20%) and coal fines (80%–97%) were blended together to produce the composite briquettes under a hydraulic press (28 MPa). The briquettes were cured at 300 °C. Density, water resistance, drop to fracture, impact resistance, and cold crushing strength were evaluated for the composite briquettes. The proximate, ultimate, and calorific value analyses were carried out according to different ASTM standards. Microstructural studies were carried out using scanning electron microscope and electron probe microanalyzer equipped with energy dispersive x-ray. Fourier Transform Infrared Spectrophotometer (FTIR) was used to obtain the functional groups in the raw materials and briquettes. The density of the composite briquettes ranged from 0.92 to 1.31 g/cm³ after curing. Briquettes with < 10% torrefied biomass has good water resistance index (> 95%). The highest cold crushing strength of 4 MPa was obtained for briquettes produced from 97% coal fines and 3% torrefied biomass. The highest drop to fracture (54 times/2 m) and impact resistance index (1350) were obtained for the sample produced from 97% coal and 3% torrefied biomass. The fixed and elemental carbons of the briquettes showed a mild improvement compared to the raw coal. The peaks from FTIR spectra for the briquettes shows the presence of aromatic C=C bonds and phenolic OH group. The composite briquettes with up to 20% torrefied biomass can all be useful as fuel for various applications.

在 260 °C 下烘烤 60 分钟的 Melina 木材与贫煤粉团聚成复合煤球，使用沥青作为粘合剂。将烘焙生物质（3%–20%）和煤粉（80%–97%）混合在一起，在液压机（28 MPa）下生产复合煤球。团块在 300°C 下固化。评估了复合团块的密度、耐水性、跌落断裂性、抗冲击性和冷压强度。根据不同的 ASTM 标准进行近似值、极限值和热值分析。使用配备能量色散 X 射线的扫描电子显微镜和电子探针显微分析仪进行微观结构研究。傅里叶变换红外分光光度计（FTIR）用于获得原料和煤球中的官能团。³固化后。< 10% 烘焙生物质的煤球具有良好的耐水性指数 (> 95%)。由 97% 的煤粉和 3% 的烘焙生物质生产的煤球获得了 4 MPa 的最高冷压强度。由 97% 煤和 3% 烘焙生物质生产的样品获得了最高的断裂落差 (54 次/2 m) 和抗冲击指数 (1350)。与原煤相比，煤球的固定碳和元素碳显示出温和的改善。煤球的 FTIR 光谱峰显示存在芳族 C=C 键和酚类 OH 基团。含有高达 20% 烘焙生物质的复合煤球均可用作各种应用的燃料。