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首页> 外文期刊>Fuel >High-pressure pyrolysis and CO_2-gasification of coal maceral concentrates: conversions and char combustion reactivities
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High-pressure pyrolysis and CO_2-gasification of coal maceral concentrates: conversions and char combustion reactivities

机译：煤软渣精矿的高温热解和CO_2气化：转化率和炭燃烧反应性

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The gasification behaviour of maceral concentrates was examined in a fixed-bed and a wire-mesh reactor. 'Extents of gasification' were calculated by subtracting sample weight loss during pyrolysis (He) from weight loss in CO_2-gasification. The effect of holding time (10 and 200 s) and pressure (1 and 20 bar) on conversions and on combustion reactivities of chars were studied. During short hold-time gasification experiments (10 s), liptinites gave the highest conversions, followed by the vitrinites and the inertinites. Vitrinite conversions decreased sharply above 90/100 elemental-C content. Extents of gasification were found to be in the order: vitrinites > liptinites > inertinites. However, at 200 s, a marked increase in inertinite conversion translated into a clear change of relative ordering to: inertinites > vitrinites > liptinites. The high gasification reactivities of inertinites at longer times appear to be related to a more rigid and porous structure, but the late surge suggests that an induction period is needed. More detailed time series data are required. Relative combustion reactivities of chars were generally observed to decrease with (i) pressure, (ii) time at temperature and (iii) increasing elemental carbon content. The data indicated that orders of gasification reactivities may be predicted from the order of combustion reactivities of pyrolysis chars. Inertinite concentrate chars were more reactive. However, the difference in reactivity between inertinite chars and other samples was reduced when the inertinites were heated rapidly--possibly owing to melting at the higher heating rates.
机译：在固定床和金属丝网反应器中检查了黄石精矿的气化行为。通过从CO 2气化中的重量损失中减去样品在热解过程中的重量损失（He）来计算“气化程度”。研究了保持时间（10和200 s）和压力（1和20 bar）对转化率和焦炭燃烧反应性的影响。在短时间的气化实验（10 s）中，脂铁矿的转化率最高，其次是镜质石和惰质子。在90/100的元素C含量以上时，堇青石的转化率急剧下降。发现气化程度的顺序为：镜质体>脂质体>惰质体。但是，在200 s时，惰质岩转化率的显着增加转化为相对顺序的明显变化，即：惰质岩>镜质体>锂质岩。惰质岩在较长时间内的高气化反应性似乎与更刚性和多孔的结构有关，但后期的激增表明需要一个诱导期。需要更详细的时间序列数据。通常观察到炭的相对燃烧反应性随（i）压力，（ii）在温度下的时间和（iii）元素碳含量的增加而降低。数据表明，可以根据热解炭的燃烧反应性顺序来预测气化反应性的顺序。惰质精矿炭更具活性。但是，快速加热惰质石时，惰质炭与其他样品之间的反应性差异减小了，这可能是由于在较高的加热速率下熔化所致。

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