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首页> 外文OA文献 >Comparison of the explosion characteristics and flame speeds of pulverised coals and biomass in the ISO standard 1 m3 dust explosion equipment
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Comparison of the explosion characteristics and flame speeds of pulverised coals and biomass in the ISO standard 1 m3 dust explosion equipment

机译：比较IsO标准1 m3粉尘爆炸设备中粉煤和生物质的爆炸特性和火焰速度

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Pulverised coal has been known to pose explosion risks since the 19th century, with the advent of biomass use in coal fired power generation boilers the explosion risk may need revision. The objective of the present work was to compare the explosibility of two samples of bituminous coal used in UK power stations with two biomass fuels and to review available explosion data in the literature for pulverised coal and biomass. The 1 m3 ISO explosion vessel was used to determine the explosion characteristics: deflagration index (KSt), maximum explosion pressure (Pmax) and minimum explosible concentration (MEC). Flame speeds were also measured and these are relevant to understanding the mechanism of turbulent flame propagation in power station burners, which is related to the problem of flame flashback or blow-off. Despite the similarities in composition of both coals, the explosion reactivity of Colombian coal was much higher, with a KSt value of 129 bar m/s compared to 78 bar m/s for Kellingley coal. The main difference between the two fuels was the surface area of particles which was higher for Colombian coal. It was shown that the char burn out rate at 900 °C in air was higher for Colombian coal, due to the greater oxygen diffusion in the higher porosity of the char. Results for two biomass fuels are also presented with similar values for KSt and the literature review shows that both coal and biomass have very variable flame reactivities. There is no general trend that coal is less reactive than biomass, although this could be the case for specific coals and biomass.
机译：自19世纪以来，煤粉就构成了爆炸危险，随着燃煤发电锅炉中使用生物质的出现，爆炸危险可能需要修正。本工作的目的是比较英国发电厂使用的两种烟煤样品与两种生物质燃料的爆炸性，并复习文献中有关粉煤和生物质的可用爆炸数据。 1 m3 ISO爆炸船用于确定爆炸特性：爆燃指数（KSt），最大爆炸压力（Pmax）和最小爆炸浓度（MEC）。还测量了火焰速度，这些速度与理解电站燃烧器中湍流火焰传播的机理有关，这与火焰回燃或吹出问题有关。尽管两种煤的成分相似，但哥伦比亚煤的爆炸反应性要高得多，KSt值为129 bar m / s，而Kellingley煤的KSt值为78 bar m / s。两种燃料之间的主要区别是颗粒的表面积，哥伦比亚的煤更高。结果表明，在哥伦比亚，900℃的空气中焦炭燃尽率更高，这是由于较高的炭孔隙率中氧的扩散更大。两种生物质燃料的结果也与KSt值相似，文献综述表明，煤和生物质的火焰反应性都变化很大。尽管特定的煤炭和生物质可能会发生这种情况，但煤炭没有比生物质反应活性低的普遍趋势。

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