Fuel properties evaluation and inherent correlation analysis of oxidatively torrefied corn stalk

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy Pub Date : 2024-11-08 DOI:10.1016/j.renene.2024.121855

Congyu Zhang , Yong Zhan , Wei-Hsin Chen , Ying Zhang

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Abstract

Fuel properties evaluation and inherent correlation analysis of the biochar are important in assessing the variation of fuel performance. This study investigates fuel performance changes under different oxidative torrefaction conditions of corn stalks. The obtained results imply that such a method is conducive to enhancing fuel properties, with the values of energy-mass co-benefit index (EMCI), upgrading energy index (UEI), Hardgrove grindability index (HGI), and equilibrium moisture content (EMC) range at 4–9, 500–3500, 60–120, and 9.5–12. This indicates that oxidative torrefaction is efficient for fuel performance improvement. For elemental transformation and carbonization degree, the oxidatively torrefied biochar possesses a higher proportion of elemental carbon content and better graphitization degree (GD), thus contributing to a more stable structure. Good linear relationships are exhibited from the analysis of comprehensive pyrolysis index (CPI) versus elemental carbon proportion (ECP), comprehensive combustion index (CCI) versus ECP, CPI versus GD, and CCI versus GD, with correlation coefficients of 0.9741, 0.9524, 0.9689, and 0.9166, respectively. This suggests that the carbonization extent is highly related to biochar pyrolysis and combustion characteristics. Overall, the obtained results are conducive to enhancing inherent correlation cognition of fuel property indicators. In doing so, the fuel property can be better adjusted for performance enhancement, thus facilitating efficient biochar production with better industrial application potential.

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氧化焦化玉米秸秆的燃料特性评估和内在关联分析

生物炭的燃料特性评估和内在相关性分析对于评估燃料性能的变化非常重要。本研究调查了玉米秸秆在不同氧化热解条件下的燃料性能变化。结果表明，这种方法有利于提高燃料性能，其能量-质量协同效益指数（EMCI）、升级能量指数（UEI）、哈德格罗夫可磨性指数（HGI）和平衡含水量（EMC）的值范围分别为 4-9、500-3500、60-120 和 9.5-12。这表明氧化焦烧能有效改善燃料性能。在元素转化和碳化程度方面，氧化焦烧生物炭的元素碳含量比例更高，石墨化程度（GD）更高，因此结构更稳定。综合热解指数（CPI）与元素碳比例（ECP）、综合燃烧指数（CCI）与 ECP、CPI 与 GD、CCI 与 GD 的相关系数分别为 0.9741、0.9524、0.9689 和 0.9166。这表明碳化程度与生物炭热解和燃烧特性高度相关。总之，所得结果有利于增强燃料特性指标的内在关联认知。这样，就可以更好地调整燃料特性以提高性能，从而促进生物炭的高效生产，并具有更好的工业应用潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Renewable Energy 工程技术-能源与燃料

CiteScore

18.40

自引率

9.20%

发文量

1955

审稿时长

6.6 months

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