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首页> 外文期刊>Fuel >Spontaneous combustion of carbonaceous stockpiles. Part II. Factors affecting the rate of the low-temperature oxidation reaction
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Spontaneous combustion of carbonaceous stockpiles. Part II. Factors affecting the rate of the low-temperature oxidation reaction

机译：碳质储存料的自燃。第二部分影响低温氧化反应速率的因素

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In part I of this paper, the rate of the low-temperature oxidation reaction was found to be critical in determining the relative tendency of a carbonaceous material to self heat and hence undergo spontaneous combustion. A static isothermal apparatus was designed to directly measure rates of reaction at constant oxygen concentrations and at low temperatures. The results show the relative importance of extrinsic factors such as particle size, ambient humidity, oxygen concentration and concentration of reaction product. A distributed-rate model shows that the apparent fractional order of reaction with respect to oxygen can be explained by allowing for a distribution of first-order rate constants. The results are consistent with the porous structure of coal and with microscopic examination of oxidised coals. Sufficient samples were tested and analysed to perform statistical modelling, which relates the intrinsic properties measured by proximate, ultimate and petrographic analyses to the rate of oxidation of a coal. It was shown that the two factors that had the most statistical significance in determining the propensity for self-heating were the volatile content and the inherent moisture. It is suggested that the inherent moisture is related to the total surface area of the sample, and that the volatile matter component represents the reactive component. Measurement of these two parameters gives a reasonable prediction of a sub-bituminous coal's rate of reaction with oxygen at ambient temperature, and quickly identifies 'at risk' samples for further testing. A separate set of experiments was conducted to examine the comparative importance of the sorption of moisture. It was shown that the rate of vapour phase adsorption and desorption of moisture is slow compared to the oxidation reaction.
机译：在本文的第一部分中，发现低温氧化反应的速率对于确定碳质材料自热并因此自燃的相对趋势至关重要。设计了静态等温设备，以直接测量恒定氧气浓度和低温下的反应速率。结果显示了外部因素的相对重要性，例如粒径，环境湿度，氧气浓度和反应产物的浓度。分布速率模型表明，可以通过允许一级速率常数的分布来解释相对于氧气的表观反应分数阶。结果与煤的多孔结构和氧化煤的显微检查一致。对足够的样品进行了测试和分析，以进行统计建模，该模型将通过邻近分析，最终分析和岩石学分析测得的内在特性与煤的氧化速率相关。结果表明，在确定自热倾向中，最具有统计学意义的两个因素是挥发物含量和固有水分。建议固有水分与样品的总表面积有关，并且挥发性物质成分代表反应性成分。这两个参数的测量可以合理预测亚烟煤在环境温度下与氧气的反应速率，并迅速识别出“有风险”的样品以进行进一步测试。进行了另一组实验以检验水分吸附的相对重要性。结果表明，与氧化反应相比，气相吸附和解吸水分的速率慢。

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