通过慢速和快速热解生产生物炭实现花生壳的增值及其详细的物理化学特性分析

Gajanan Sawargaonkar, Rajesh Pasumarthi, Santosh Kale, Pushpajeet L. Choudhari, S. Rakesh, Srikanth Mutnuri, Ajay Singh, Harikishan Sudini, Manasa Ramaraju, Ramesh Singh, A. K. Padhee, M.L. Jat
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引用次数: 0

摘要

最近,在将农业废弃物热转化为生物炭的背景下,花生壳的价值得到了凸显,生物炭是一种富含碳的副产品,具有作为土壤改良剂的巨大潜力。本研究旨在了解慢速(450°C 和 500°C)和快速(550°C 和 600°C)热解温度(驻留时间分别为 60 分钟和 30 分钟)对低成本窑炉生产的花生壳生物炭的物理化学特性的影响。扫描电子显微镜分析结果表明,热解温度升高会增加孔隙率和表面粗糙度,并出现结晶沉积。热重分析表明,温度升高有助于提高热稳定性,但会降低生物炭产量。热解温度为 450、500、550 和 600°C 时,转化效率分别为 32.19%、29.13%、21.8% 和 19.43%,有机碳含量分别为 11.57%、6.48%、8.64% 和 7.76%。随着温度的升高,官能团(C-H 和 C-O)的强度下降,而 C=C 和稳定碳含量的强度上升。所有生物炭样品中的重金属浓度均低于国际生物炭倡议规定的允许限值。研究得出结论,就质量和数量特征而言,450°C、60 分钟驻留时间的缓慢热解是生产花生壳生物炭的理想热解条件。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Valorization of peanut shells through biochar production using slow and fast pyrolysis and its detailed physicochemical characterization
Valorization of peanut shells has recently gained prominence in the context of thermally converting agricultural waste into biochar, a carbon-rich byproduct with significant potential as a soil amendment. The present study delves into understanding the influence of slow (450°C and 500°C) and fast (550°C and 600°C) pyrolysis temperatures with a resident time of 60 and 30 minutes, respectively, on the physico-chemical properties of peanut shell biochar produced in a low-cost kiln. Results of the Scanning Electron Microscopy analysis revealed that increased pyrolysis temperature increased porosity and surface roughness with crystalline deposits. Thermogravimetric analysis showed that increased temperatures contributed to enhanced thermal stability but reduced biochar yield. Pyrolysis temperatures of 450, 500, 550, and 600°C exhibited 32.19, 29.13, 21.8, and 19.43 percent conversion efficiency with organic carbon content of 11.57, 6.48, 8.64, and 7.76 percent, respectively. The intensities of functional groups (C-H and C-O) declined, whereas the intensity of C=C and stable carbon content increased with the rise in temperatures. The concentrations of heavy metals in all biochar samples were below permissible limits outlined by international biochar initiatives. The study concluded that slow pyrolysis at 450°C for 60 minutes resident time is an ideal pyrolytic condition for producing peanut shell biochar in terms of qualitative and quantitative characteristics.
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