Greenhouse gas emissions from low-temperature oxidation and spontaneous combustion at open-cut coal mines in Australia
Greenhouse gas emissions from low-temperature oxidation and spontaneous combustion at open-cut coal mines in Australia
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DOI：
10.1016/j.coal.2008.12.001
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发表时间：
2009-04-01
影响因子：
5.6
通讯作者：
Williams, David J.
中科院分区：
文献类型：
--
作者：
Carras, John N.;Day, Stuart J.;Williams, David J.
露天煤矿废煤的自燃和低温氧化是温室气体排放的一个巨大潜在来源。本文介绍了在澳大利亚猎人谷和鲍文盆地的11个矿山测量的废石堆和废煤堆放场的CO2和CH 4排放通量。数据显示出相当大的分散性，这与弃土堆材料和表面渗透性的不均匀性相一致。尽管分散，排放量能够被分为三大类，根据自燃的强度存在于材料。平均排放量从12千克CO2-e yr（-1）m（-2）到8，200千克CO2-e yr（-1）m（-2）不等，取决于自燃的强度。也有，在分散的数据，一个近似线性的趋势，增加排放通量与增加表面温度。该研究的一个关键发现是，没有自燃，但只有煤和煤废料的低温氧化的废石堆的温室气体排放率与植被表面生物活动的排放率相似。然而，需要进一步的研究来量化没有自燃的弃土堆对人为大气CO2负担的贡献程度。(C)2008年由Elsevier B. V.出版。
Spontaneous combustion and low-temperature oxidation of waste coal in open-cut coal mines represents a potentially large source of greenhouse gas emissions. In this paper, emission fluxes of CO2 and CH4 from spoil piles and waste coal dumps measured at 11 mines in the Hunter Valley and Bowen Basin in Australia are presented. The data displayed considerable scatter, which is consistent with the inhomogeneous nature of spoil pile material and permeability of surfaces. Despite the scatter, emissions were able to be classified into three broad categories according to the intensity of the spontaneous combustion present in the material. Average emissions ranged from about 12 kg CO2-e yr(-1) m(-2) to 8200 kg CO2-e yr(-1) m(-2), depending on the intensity of the spontaneous combustion. There was also, within the scatter of the data, an approximately linear trend of increasing emission flux with increasing surface temperature. A key finding of the research is that the emission rates of greenhouse gases from spoil piles where there is no spontaneous combustion, but only low-temperature oxidation of coal and coal waste, are similar to the emission rates due to biological activity from vegetated surfaces. However, further research is required to quantify the degree to which spoil piles that have no spontaneous combustion contribute to the anthropogenic atmospheric CO2 burden. (C) 2008 Published by Elsevier B.V.