Non-isothermal study of gasification process of coal char and biomass char in CO2 condition

IF 3.1 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-10-01 DOI:10.1016/S1006-706X(17)30144-9

Tao Xu , Guang-wei Wang , Jian-liang Zhang , Teng-fei Song , Run-sheng Xu

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引用次数: 8

Abstract

Non-isothermal method was used to study gasification characteristics of three coal chars and one biomass char. Four chars were made from anthracite coal (A), bituminous coal (B), lignite coal (L), and wood refuse (W), respectively. The gasification process was studied by random pore model (RPM), unreacted core model (URCM) and volumetric model (VM). With an increase in metamorphic grade, the gasification reactivity of coal char decreased, and the gasification reactivity of biomass char was close to that of low metamorphic coal char. With an increase in heating rate, the gasification of all samples moved towards high temperature zone, and the whole gasification time decreased. It was concluded from kinetics analysis that the above-mentioned three models could be used to describe the gasification process of coal char, and the RPM fitted the best among the three models. In the RPM, the activation energies of gasification were 193. 9, 225. 3 and 202. 8 kJ/mol for anthracite coal char, bituminous coal char and lignite coal char, respectively. The gasification process of biomass char could be described by the URCM and VM, while the URCM performed better. The activation energy of gasification of wood refuse char calculated by the URCM was 282. 0 kJ/mol.

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CO2条件下煤焦和生物质焦气化过程的非等温研究

摘要采用非等温法研究了三种煤焦和一种生物质焦的气化特性。用无烟煤(A)、烟煤(B)、褐煤(L)和木材垃圾(W)分别制备了四种炭。采用随机孔隙模型(RPM)、未反应核模型(URCM)和体积模型(VM)对气化过程进行了研究。随着变质等级的增加，煤焦的气化反应活性降低，生物质焦的气化反应活性接近低变质煤焦。随着升温速率的增加，所有样品的气化都向高温区移动，整个气化时间缩短。动力学分析表明，上述三种模型均可用于描述煤焦的气化过程，其中RPM模型拟合效果最好。在RPM下，气化活化能为193。9日,225年。3和202。无烟煤、烟煤和褐煤分别为8kj /mol。URCM和VM均能描述生物质炭的气化过程，URCM的气化效果更好。通过URCM计算得出木质垃圾焦的气化活化能为282。0焦每摩尔。

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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