从分类的木材废料中优化生物炭产量,作为燃烧成灰的可持续替代品

Similade A. Adeodun, A. Sangodoyin, M. B. Ogundiran
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引用次数: 3

摘要

木材废弃物是温室气体和气候变化的主要贡献者之一。木材废料燃烧产生二氧化碳,而分解产生甲烷。代替这些排放,木材废料可以转化为生物炭,这有很多新的应用。然而,低生物炭产量是木材废料的共同限制,本质上是由于在不同条件下热解的不同分类树木的混合物。在本研究中,通过不同的热解温度和时间来优化分类后的木材废弃物的生物炭产量。比较了优化后的生物炭和灰在水电电网和柴油发电方案下的功耗、成本和碳足迹。硬木锯末炭(HSC)、软木锯末炭(SSC)和混合锯末炭(MSC)在2小时内的最佳热解率分别为33.6%(400℃)、29.4%(350℃)和18.5%(400℃)。并网供电和柴油供电烟灰的CO2排放量分别为2.49 kg和19.0 kg。柴油发电机发电成本是电网发电成本的17倍。木材废弃物均匀炭化产炭效果较好;它们的碳足迹更小,而且利用电网发电的成本更低。代替燃烧的木材废料可以加工成廉价和环保的生物炭。
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Optimisation of Biochar Yield from Sorted Wood Wastes as Sustainable Alternatives to Burning to Ash
Abstract Wood wastes are one of the leading contributors of greenhouse gases cum climate change. While the burning of wood wastes results in CO2 emission, decomposition generates methane. In place of these emissions, wood wastes can be converted into biochars which have a lot of novel applications. However, low biochar yield was the common limitation of wood wastes, essentially, due to a mixture of different classifications of trees that pyrolyse at different conditions. In this study, biochar yield from sorted wood wastes was optimised by varying pyrolysis temperature and time. Power consumption, cost, and carbon footprint of the optimised biochar and ash were compared for both hydropower grid and diesel generator scenarios. Optimal pyrolysis yields were 33.6 % (400 °C), 29.4 % (350 °C) and 18.5 % (400 °C) respectively for hardwood sawdust char (HSC), softwood sawdust char (SSC), and mixed sawdust char (MSC) at 2 hours duration for all materials. The CO2 emissions from ash were 2.49 kg and 19.0 kg respectively for grid and diesel power supply. The diesel generator power was 17 times more expensive than grid power for wood wastes pyrolysis. Wood wastes have better biochar yield when charred homogenously; they have a smaller carbon footprint and are cheaper when produced with power from the grid. Wood wastes in place of being burnt can be processed as inexpensive and environment-friendly biochar.
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