Department of Mechanical Engineering, Landmark University, Omu Aran, Nigeria.
Department of Materials and Metallurgical Engineering, University of Ilorin, Ilorin, Nigeria.
Sci Rep. 2021 Jan 12;11(1):547. doi: 10.1038/s41598-020-79510-9.
The behaviour of ash of fuel affects its thermal efficiency when in use. The ash analyses of bio-coal briquettes developed from lean grade coal and torrefied woody biomass have received limited intensive study. Therefore, the present study aims at analysing the ashes of briquette made from lean grade coal and torrefied woody biomass using blended coal tar pitch and molasses as the binder. Bio-coal briquettes were produced from coal and torrefied biomass in various hybrid ratios. Ashing of various briquettes was done in a muffle furnace at 850 °C for 3 h. Mineral phases of the ash were identified using an X-ray Diffractometer (XRD), while the mineral oxides were obtained using an X-ray Fluorescence Spectrometer. The AFT700 Furnace was used with its AFT700 software to evaluate the ash fusion temperatures of the ashes. The XRD patterns look similar, and quartz was found to be the dominant mineral phase present in the raw coal and bio-coal briquettes. The SiO (57-58%), AlO (19-21%), and FeO (8-9%) were the major oxides observed in the ashes. The final fusion temperatures of the ashes range from 1300-1350 °C. The compositions of the ashes of the bio-coal briquettes are classified as detrital minerals. It was concluded that the addition of torrefied biomass (≤ [Formula: see text]and blended binder ([Formula: see text] 15%) to coal gave a negligible impact on the ashes of the resultant bio-coal briquettes.
燃料灰分的行为会影响其使用时的热效率。对于由贫煤和热解木质生物质制成的型煤的灰分分析已经进行了有限的深入研究。因此，本研究旨在分析由贫煤和热解木质生物质制成的型煤的灰分，使用混合煤焦油沥青和糖蜜作为粘合剂。在各种混合比例下，由煤和热解生物质生产了型煤。在马弗炉中于 850°C 下对各种型煤进行灰化 3 小时。使用 X 射线衍射仪（XRD）鉴定灰分的矿物相，使用 X 射线荧光光谱仪获得矿物氧化物。使用 AFT700 炉及其 AFT700 软件评估灰分的灰熔融温度。XRD 图谱看起来相似，并且发现石英是原煤和型煤中存在的主要矿物相。灰分中观察到的主要氧化物为 SiO（57-58%）、AlO（19-21%）和 FeO（8-9%）。灰分的最终熔融温度范围为 1300-1350°C。型煤灰分的组成被归类为碎屑矿物。研究结论表明，向煤中添加热解生物质（≤[公式：见文本]和混合粘合剂（[公式：见文本]15%）对所得型煤灰分的影响可以忽略不计。
