The Minimum Ignition Energy of Coal Dust in an Oxygen Enriched Atmosphere
The Minimum Ignition Energy of Coal Dust in an Oxygen Enriched Atmosphere
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富氧气氛中煤尘的最低着火能
DOI：
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发表时间：
2013
影响因子：
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通讯作者：
F. Verplaetsen
中科院分区：
文献类型：
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作者：
F. Norman;J. Berghmans;F. Verplaetsen
在煤的氧/燃料燃烧中，煤粉与氧气一起燃烧，其浓度大于目前允许的21%。这很可能为碳固存提供了与其他技术（如燃烧前和燃烧后捕获）相比的优势。然而，随着氧气浓度和温度的升高，粉尘爆炸的风险显著增加。本文研究了富氧浓度对印尼（Sebuku）煤尘和匹兹堡（Pittsburgh）煤尘n°8粉尘爆炸特性的影响。首先确定了空气中的点火灵敏度特性（最小点火能量和最小点火温度）和爆炸严重性特性（最大爆炸压力，Pmax和最大压力上升速率，Kst）。然后确定了两种煤在富氧CO2气氛中的最小点火能量。Sebuku煤在空气中的最小点火能为55 mJ，而匹兹堡煤的最小点火能大于1000 mJ。在30 vol% O2的CO2混合气中的点火灵敏度与空气中的点火灵敏度基本一致。在50 vol% O2的CO2混合物中，Sebuku煤的点火能量显著降低至1.4 mJ，匹兹堡煤为4.7 mJ。
In oxy/fuel combustion of coal, the pulverised coal is burned with oxygen at concentrations greater than the currently allowed value of 21 %. This may well provide advantages in carbon sequestration against other technologies such as pre- and post-combustion capture. However the risk of dust explosions increases significantly with increasing oxygen concentration and temperature. In this study the influence of enriched oxygen concentrations is researched on the dust explosion characteristics of Indonesian (Sebuku) coal dust and of Pittsburgh coal n°8. First the ignition sensitivity characteristics (minimum ignition energy and minimum ignition temperatures) and explosion severity characteristics (maximum explosion pressure, Pmax, and maximum rate of pressure rise, Kst ) are determined in air. Thereafter the minimum ignition energy is determined of both coals in an oxygen enriched CO2 atmosphere. The minimum ignition energy in air of the Sebuku coal was equal to 55 mJ, while the minimum ignition energy of the Pittsburgh coal was higher than 1000 mJ. The ignition sensitivity in a 30 vol% O2 in CO2 mixture was in good agreement to the ignition sensitivity in air. In a 50 vol% O2 in CO2 mixture the ignition energy decreased significantly to a value of 1.4 mJ for the Sebuku coal and 4.7 mJ for the Pittsburgh coal n°8.