Abstract

Biochar can be used as a solid fuel for space heating and as soil amendment to improve agricultural production. Availability of biomass feedstock and carbonization temperature are determinant factors influencing the production and applications of biochar. Arundo donax is a promising C₃ perennial crop with high biomass yield and adaptation to poor soil conditions, making it a suitable, low-cost and sustainable feedstock source for biochar production. Therefore, the aim of this study is to investigate the influence of high carbonization temperatures on key performance indicators of Arundo donax derived biochar in its heating and soil amendment applications. Biochars were produced at carbonization temperature of 500, 700 and 900 °C. Key performance indicators including proximate composition, thermal recalcitrance, combustion and energy characteristics, pH and electrical conductivity were analyzed. Increase in carbonization temperature resulted in increased fixed carbon (77.08–81.43%) and ash content (8.04–10.67%) while volatile content (7.90–14.87%) decreased. Ignition (382–535 °C), peak (460–620 °C) and burnout (530–670 °C) temperatures of biochars increased correspondingly with the carbonization temperature. Calorific value slightly increased from 29.51 to 29.94 MJ/kg. pH values (7.31–9.67) showed that the biochars are slightly alkaline. Recalcitrance index increased from 0.49 to 0.68 as the carbonization temperature increased. Microstructures of the biochars showed an improved porous structure as the carbonization temperature increased. Improvement in the key performance indicators of the biochars showed that high carbonization temperature can significantly enhance the satisfactory performance of Arundo donax derived biochars in its heating and soil amendment applications.

摘要

生物炭可用作空间加热的固体燃料和土壤改良剂以改善农业生产。生物质原料的可用性和碳化温度是影响生物炭生产和应用的决定性因素。Arundo donax是一种很有前景的 C ₃多年生作物，具有高生物量产量和对恶劣土壤条件的适应性，使其成为生物炭生产的合适、低成本和可持续的原料来源。因此，本研究的目的是研究高碳化温度对芦竹关键性能指标的影响。衍生生物炭在其加热和土壤改良应用中的应用。在 500、700 和 900 °C 的碳化温度下生产生物炭。分析了包括近似成分、热阻、燃烧和能量特性、pH 值和电导率在内的关键性能指标。炭化温度升高导致固定碳（77.08-81.43%）和灰分（8.04-10.67%）增加，而挥发分（7.90-14.87%）降低。生物炭的点火（382-535°C）、峰值（460-620°C）和燃尽（530-670°C）温度随着碳化温度的升高而相应增加。热值从 29.51 微升至 29.94 MJ/kg。pH 值（7.31-9.67）表明生物炭呈弱碱性。随着碳化温度的升高，不顺从指数从 0.49 增加到 0.68。随着碳化温度的升高，生物炭的微观结构显示出改进的多孔结构。对生物炭关键性能指标的改进表明，高碳化温度可以显着提高生物炭的令人满意的性能。Arundo donax在其加热和土壤改良应用中衍生的生物炭。