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The fate of fluorine and chlorine during thermal treatment of coals

机译：煤热处理过程中氟和氯的去向

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摘要

Release behaviors of fluorine and chlorine during thermal treatments of two Chinese coals, DT and JC, were studied in a quartz tube reactor. The thermal treatments included temperature programmed decomposition (TPD, 300-1000 degrees C) in N-2 and gasification (800-1100 degrees C) under a H2O or CO2 atmosphere. The TPD results show that F and Cl in the two coals can be classified into three forms of occurrence, evolving in three temperature ranges, 150-350 degrees C, 350-750 degrees C, and > 870 degrees C. Fluorine in the coals is significantly more stable than Cl during the TPD process. Both elements in DT coal are more volatile than that in JC coal, which may be attributed to coexisting F or Cl salts with minerals in JC coal. Gasification under a H2O or CO2 atmosphere may promote the release of F and Cl. The promotion effect is more significant in a H2O steam, which is due possibly to reactions of H2O with F and Cl salts in the coals. For both coals, the release ratios are close to 94% for F and 98% for Cl at 1000 degrees C in a H2O steam. Under these conditions, the difference in release ability of F and Cl from the two coals diminishes. No clear correlation can be found between the release ratio of F or Cl with the corresponding volatile yield of the coals.
机译：在石英管反应器中研究了两种中国煤DT和JC热处理过程中氟和氯的释放行为。热处理包括在N-2中进行程序升温分解（TPD，300-1000摄氏度），以及在H2O或CO2气氛下进行气化（800-1100摄氏度）。 TPD结果表明，两种煤中的F和Cl可以分为三种发生形式，分别在三个温度范围内变化：150-350摄氏度，350-750摄氏度和> 870摄氏度。在TPD过程中，Cl明显比Cl稳定。 DT煤中的两种元素比JC煤中的挥发性更高，这可能归因于F或Cl盐与JC煤中的矿物共存。在H2O或CO2气氛下气化可促进F和Cl的释放。在H2O蒸汽中，促进作用更为显着，这可能是由于H2O与煤中F和Cl盐的反应所致。对于两种煤，在H2O蒸汽中，在1000摄氏度下，F的释放率接近94％，Cl的释放率接近98％。在这些条件下，两种煤中F和Cl释放能力的差异减小。在F或Cl的释放率与相应的煤挥发分之间未发现明显的相关性。

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