粒径、压实压力和焙烧对粒状玉米芯渣的质量和热性能的影响

Nurudeen Sabi Saidu, Muhammad Alamin Aladodo, H. A. Ajimotokan
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引用次数: 0

摘要

用于固体燃料开发的焙烧和生物质颗粒化被认为是减轻对化石燃料依赖和环境挑战的可持续能源解决方案。研究了颗粒大小、压实压力和焙烧对玉米芯渣颗粒质量和热性能的影响。玉米芯样品采集、分选、粉碎后进行焙烧预处理。将玉米芯放入炉中,温度和停留时间分别为280°C和30分钟。通过最初将氮气净化到固化室中,并在过程中以100mL/min的速度通过,达到并保持惰性气氛。粗玉米芯和碳化玉米芯细粒被筛选为0.3毫米,0.5毫米和1.0毫米的晶粒尺寸。使用淀粉作为粘合剂(5% wt),在50 MPa, 75 MPa和100 MPa的压实压力下,使用各自的原料和碳化颗粒生产颗粒。虽然所有颗粒样品都表现出良好的质量和热性能,但玉米芯碳化颗粒更好。此外,颗粒大小和压实压力对所生产的球团也有显著的影响。生玉米芯颗粒和碳化玉米芯颗粒的压缩密度从760到1,250 kg/m3和637到920 kg/m3不等。从1.0 mm的固化颗粒样品中获得的最大热值为25.8 MJ/kg,与相同粒径的生玉米芯18.8 MJ/kg相比,提高了37.2%。所有粒径的碳化玉米芯所得到的能量值与煤所得到的能量值相比是有利的。通过对颗粒化玉米芯渣的粒度、压实压力和焙烧对其质量和热性能的影响的研究,证明了它可以代替煤,因此可以用于能源应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
THE EFFECTS OF PARTICLE SIZE, COMPACTION PRESSURE, AND TORREFACTION ON QUALITY AND THERMAL PROPERTIES OF PELLETIZED CORNCOB RESIDUES
Torrefaction and biomass pelletization into pellets for solid fuel development are considered sustainable energy solutions to mitigate fossil fuel dependency and environmental challenges. This study investigated the effect of particle size, compaction pressure, and torrefaction on the quality and thermal properties of pelletized corncob residues. The corncob samples were collected, sorted, and pulverized before the torrefaction pretreatment. The torrefaction was achieved by placing the corncob in a furnace at a temperature and residence time of 280 °C and 30 minutes, respectively. The inert atmosphere was attained and maintained by initially purging a nitrogen gas into the torrefying chamber and passing it at 100mL/min during the processes. The raw and torrefied corncob fines were screened to 0.3 mm, 0.5 mm, and 1.0 mm grain sizes. Using starch as a binder (5% wt), pellets were produced employing their respective raw and torrefied fines at compaction pressures of 50 MPa, 75 MPa, and 100 MPa. Though all pellet samples exhibited good quality and thermal properties, the pellets from torrefied corncob are better. Also, the effects of particle size and compaction pressure are significant on the produced pellets. The compressed density varied from 760 to 1,250 kg/m3 and 637 to 920 kg/m3 for raw and torrefied corncob pellets. A maximum heating value of 25.8 MJ/kg was obtained from the torrefied pellet sample of 1.0 mm, rendering improvements of 37.2% when compared with 18.8 MJ/kg of raw corncob of the same particle size. The energy values obtained for torrefied corncob for all particle sizes compared favorably with the value obtained in coal. Investigation of particle size, compaction pressure, and torrefaction on quality and thermal properties of pelletized corncob residue proved that it can replace coal and hence could be used for energy applications.
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