ANALYSIS OF PHYSICOCHEMICAL PROPERTIES AND COMBUSTION CHARACTERISTICS OF WALNUT SHELL, CORN STALK AND RICE HUSK BIOCHAR

Xu Yanghui; Zhang Xiang; Ma Guojun; Zheng Dingli; Liu Mengke; Cui Guoyu

doi:10.19912/j.0254-0096.tynxb.2024-2220

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (4) : 460-466. DOI: 10.19912/j.0254-0096.tynxb.2024-2220

ANALYSIS OF PHYSICOCHEMICAL PROPERTIES AND COMBUSTION CHARACTERISTICS OF WALNUT SHELL, CORN STALK AND RICE HUSK BIOCHAR

Xu Yanghui^1,2, Zhang Xiang^1,2, Ma Guojun^1,2, Zheng Dingli^1,2, Liu Mengke^1,2, Cui Guoyu^1,2

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Abstract

Walnut shell biochar, corn stalk biochar, and rice husk biochar were selected to examine their potential as a substitute for traditional fossil fuels in terms of physicochemical properties and combustion characteristics. The findings show that all three types of biochar have fixed carbon contents of more than 60%. The three types of biochar are verified to have average particle sizes of 144.40±0.77, 10.58±0.01, and 18.61±0.01 μm for walnut shell biochar, corn stalk biochar, and rice husk biochar, respectively. Meanwhile, their Hardgrove grindability indexes are 47.37±1.22, 58.31±1.39, and 27.19±1.16, respectively, suggesting poor grindability. At a heating rate of 10 ℃/min, the comprehensive combustion characteristic index S of walnut shell biochar, corn stalk biochar, and rice husk biochar are 1.36×10-11, 4.37×10-12 and 2.34×10-11, respectively. When the heating rate is 15 ℃/min and 20 ℃/min, the comprehensive combustion characteristic index S of the above biochar increases significantly. The back flame lengths of walnut shell biochar, corn stalk biochar, and rice husk biochar are all less than 400 mm, indicating weak explosibility.

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biofuels / physicochemical properties / combustibility / walnut shell biochar / corn stalk biochar / rice husk biochar

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Xu Yanghui, Zhang Xiang, Ma Guojun, Zheng Dingli, Liu Mengke, Cui Guoyu. ANALYSIS OF PHYSICOCHEMICAL PROPERTIES AND COMBUSTION CHARACTERISTICS OF WALNUT SHELL, CORN STALK AND RICE HUSK BIOCHAR[J]. Acta Energiae Solaris Sinica. 2026, 47(4): 460-466 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2220

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