Abstract To understand the oxidation reaction of coal and predict and control generation and development of coal fires, a one-step global dynamic model of the chemical reaction between coal and oxygen considering multi-material actions was established. A volume-averaged oxygen consumption rate (OCR) to evaluate the characteristics of the oxidation reaction of coal was proposed. The results demonstrate that, in the reaction between coal and oxygen, the dominant effects of temperature and oxygen concentration on the reaction rate of coal oxidation also change. There is a certain time-lag between changes of the temperature during coal oxidation and combustion and the reaction rate: the changes of temperature parameters fail to reflect the instantaneous reaction rate in real time. By changing the volume fraction of oxygen and the programmed heating rate, it is found that increasing the volume fraction of oxygen and the heating rate both can promote the reaction between coal and oxygen and reduce the hysteretic effects of heating in the reaction under external heating. Therefore, controlling the temperature storage conditions is beneficial to preventing the oxidation reaction of coal in its early stage, while changing the oxygen supply conditions can control the development of coal spontaneous combustion in its later stage.

中文翻译：

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煤在程序升温条件下氧化反应特性的数值研究

摘要 为了解煤的氧化反应，预测和控制煤火的发生发展，建立了考虑多物质作用的煤与氧化学反应的一步全局动力学模型。提出用体积平均耗氧率（OCR）来评价煤的氧化反应特性。结果表明，在煤与氧气的反应中，温度和氧气浓度对煤氧化反应速率的主导作用也发生了变化。煤氧化燃烧过程中的温度变化与反应速率存在一定的时滞性：温度参数的变化不能实时反映瞬时反应速率。通过改变氧气的体积分数和程序升温速率，发现增加氧气的体积分数和升温速率均可以促进煤与氧气的反应，减少外加热反应中的加热滞后效应。因此，控制温度储存条件有利于防止煤在早期发生氧化反应，而改变供氧条件则可以控制煤在后期自燃的发展。