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Microwave-assisted biomass pyrolysis polygeneration process using a scaled-up reactor: Product characterization, thermodynamic assessment and bio-hydrogen production
Biomass & Bioenergy ( IF 6 ) Pub Date : 2020-06-30 , DOI: 10.1016/j.biombioe.2020.105651
Ashak Mahmud Parvez , Muhammad T. Afzal , Peng Jiang , Tao Wu

Recent investigations of microwave-heated biomass pyrolysis using laboratory scale reactors have proven thermodynamically superior to electrically-heated processes. Despite these promising results, microwave pyrolysis has not been implemented commercially. Further research into diverse feedstocks and scaled-up processes would encourage commercial investment. To accomplish this, present work examines the performance of scaled-up microwave pyrolysis using corn stalk, pinewood and algae biomasses. The results showed that the lower heating value (LHV) of pyrolytic gas increased with temperature. The LHV of three biomass samples ranged from 10.3 MJ Nm−3 to 17.6 MJ Nm−3, higher than the requirement for fuel gas in district heating. Importantly, corn stalk-derived pyrolysis gas reached a LHV of 17.6 MJ Nm−3 at 600 °C, higher than gas obtained from pulverized coal gasification. The HHV value of pinewood char was the highest of the solid products at three temperatures, reaching 27.3 MJ kg−1, due to its high carbon and low oxygen contents. The energetic assessment showed that pyrolysis system efficiency (PSE) increased with temperature from augmentation of gas yields, compensating for declining char and oil yields. Corn stalk (63%) had the highest PSE at 600 °C. The exergetic efficiencies of three different biomass-based systems followed a similar trend. The exergy efficiency of each system was lower than its corresponding energy value, due to the difference in sensible heat values. The experimental results analysed through a hydrogen plant simulation, confirming that the greatest performance was achieved by utilizing algae (85 gH2 kg algae−1) as fuel, followed by pinewood (78 gH2 kg pinewood−1).



中文翻译:

使用大型反应器的微波辅助生物质热解多联产工艺:产品表征,热力学评估和生物制氢

使用实验室规模的反应器对微波加热的生物质进行热解的最新研究已证明在热力学上优于电加热过程。尽管取得了这些令人鼓舞的结果,但微波热解尚未在商业上实施。对各种原料和扩大规模的过程的进一步研究将鼓励商业投资。为了实现这一目标,本工作研究了使用玉米秸秆,松木和藻类生物质进行的微波微波热解的性能。结果表明,热解气的较低热值(LHV)随温度升高而增加。三个生物质样品的LHV范围为10.3 MJ Nm -3至17.6 MJ Nm -3,高于区域供热对燃气的要求。重要的是,源自玉米秸秆的热解气体在600°C时的LHV达到17.6 MJ Nm -3,高于粉煤气化获得的气体。在三个温度下,松木焦的HHV值是固体产品中最高的,达到27.3 MJ kg -1,由于其高碳和低氧含量。能量评估表明,热解系统效率(PSE)随着气体产量的增加而随温度增加而得到补偿,从而弥补了焦炭和石油产量的下降。玉米秸秆(63%)在600°C时具有最高的PSE。三种不同的基于生物质的系统的能量效率遵循相似的趋势。由于显热值的差异,每个系统的火用效率低于其相应的能量值。通过氢工厂模拟对实验结果进行分析,确认通过使用藻类(85 gH 2 kg藻类-1)作为燃料,然后使用松木(78 gH 2 kg松木-1)来获得最大的性能。

更新日期:2020-06-30
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