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Swelling and shrinkage behavior of raw and processed coals during pyrolysis

机译：原煤和加工煤在热解过程中的溶胀和收缩行为

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摘要

Direct observation of transient swelling and shrinkage behavior of raw coals and processed coals was conducted by using a digital camera with a long focus lens, and quantitative description of swelling and shrinkage was resulted from subsequent image processing. The results showed that the raw and processed coals in pyrolysis behaved differently. The shrinkage of the processed coals was quite different, the maximum volumetric shrinkage ratio at 1000℃ as in the range of 32-38% with swelling ratios less than 5%, and the volumetric swelling ratio increased and the shrinkage ratio decreased with the increase of coal sample density. The maximum volumetric swelling ratio of the raw coals was more prominent than those of the processed coals. The raw coal A_2 showed a maximum swelling ratio of 20-85% and the raw coal B_2 showed a maximum swelling ratio of 25-45%. The volumetric swelling ratios decreased and the shrinkage increased with the decrease of the sample size. It is considered that the different pyrolysis behaviors were mainly due to the variation in their macroscopic structures. However, the similar swelling and shrinkage curves of coal samples were observed for the same raw or processed coals. In addition, the effect of volatile matter on the volumetric shrinkage ratios would be weakened if the raw coal was crushed into powder and then pressed into processed coal samples. Scanning electron microscope analysis showed that the structure of coke after pyrolysis was also different.
机译：通过使用带有长焦距镜头的数码相机直接观察原煤和加工后煤的瞬时溶胀和收缩行为，并通过后续图像处理对溶胀和收缩进行定量描述。结果表明，热解中的原煤和加工后的煤表现不同。加工后的煤的收缩率差异很大，膨胀率小于5％时1000℃时最大体积收缩率在32-38％的范围内，随体积的增加体积膨胀率增大而收缩率减小。煤样品密度。原煤的最大体积溶胀率比经处理的煤的最大体积溶胀率更显着。原煤A_2的最大溶胀率为20-85％，原煤B_2的最大溶胀率为25-45％。随着样品尺寸的减小，体积溶胀率降低，收缩率增加。认为不同的热解行为主要是由于其宏观结构的变化。但是，对于相同的原煤或加工后的煤，观察到了相似的煤样品溶胀和收缩曲线。此外，如果将原煤粉碎成粉末，然后压制成加工过的煤样，则挥发性物质对体积收缩率的影响会减弱。扫描电子显微镜分析表明，热解后焦炭的结构也不同。

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