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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Heat treatment-induced loss of combustion reactivity of a coal char: the effect of exposure to oxygen
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Heat treatment-induced loss of combustion reactivity of a coal char: the effect of exposure to oxygen

机译：热处理引起的煤焦燃烧反应性损失：暴露于氧气的影响

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摘要

A South African bituminous coal was heat treated at different temperatures in the range 500-1300 degreesC under inert conditions with or without exposure to pulses of air. The effect of the heat treatment conditions on the reactivity of the resulting char towards oxygen under chemical kinetic controlled regime was assessed. The oxygen content of chars subjected to different heat treatment conditions was also measured by elemental analysis. Results indicated that exposure to pulses of air during the early stages of heat treatment at temperatures up to 1200 degreesC mitigates the effects of thermal annealing as far as the loss of combustion reactivity of the resulting char is concerned. Beyond about 1200 degreesC, exposure to air is ineffective to mitigate the effects of thermal annealing on combustion reactivity. Altogether, it appears that mutual interactions exist between modifications of the carbon structure induced by thermal annealing, uptake of oxygen during heat treatment and the oxy-reactivity of the resulting char. The preliminary findings of this work would suggest that the loss of carbon combustion reactivity cannot be assessed on the basis of its time-temperature history only, but modes and extent of carbon interaction with oxygen come into play. A speculative explanation of the phenomenology is presented and discussed. (C) 2004 Elsevier Inc. All rights reserved.
机译：在惰性条件下，在暴露于或未暴露于空气脉冲的情况下，在500-1300℃范围内的不同温度下对南非的烟煤进行热处理。在化学动力学控制的条件下，评估了热处理条件对所得炭与氧气反应性的影响。还通过元素分析测量了经受不同热处理条件的炭的氧含量。结果表明，就所得到的炭的燃烧反应性的损失而言，在热处理的早期阶段中，在温度高达1200℃的热处理的早期阶段，暴露于空气脉冲会减轻热退火的影响。超过约1200℃，暴露于空气不足以减轻热退火对燃烧反应性的影响。总而言之，似乎在由热退火引起的碳结构的改性，热处理过程中的氧吸收和所得炭的氧反应性之间存在相互作用。这项工作的初步发现表明，碳燃烧反应性的损失不能仅根据其时间-温度历史来评估，而是碳与氧气相互作用的方式和程度发挥了作用。现象学的一种推测性解释被提出和讨论。 （C）2004 Elsevier Inc.保留所有权利。

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