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Understanding the unusual fluidity characteristics of high ash Indian bituminous coals
Fuel Processing Technology ( IF 7.2 ) Pub Date : 2018-07-01 , DOI: 10.1016/j.fuproc.2018.04.003
Bidyut Das , A. Suresh , Pratik Swarup Dash , Sanjay Chandra , Miguel Castro Díaz , Lee A. Stevens , Colin E. Snape

High-temperature rheometry and 1H nuclear magnetic resonance (NMR) are two complementary techniques that have been used to investigate fluidity development quantitatively in the 105 Pa.s), the maximum concentration of fluid H was quite similar to that of the good coking coal (40%). This Indian non-coking coal developed fluid H with the greatest mobility (T2L > 150 μs) in the coal series, regardless of the particle size fraction studied. The probable explanation for this abnormal behavior is that the mineral matter prevents bulk movement in the sample but the local mobility of the fluid phase is still high on the nanometer scale. Blending the two Indian non-coking coals with the highly fluid medium coking coal gave higher viscosities (i.e. lower fluidity) than predicted by the polymer blend rule, probably again due to the high mineral matter restricting bulk flow. This negative effect was less pronounced with the higher ash coal suggesting that the high mobility of the fluid entities in this coal might prevent the destruction of fluid entities evolving from the medium coking coal. Partial demineralization of the high ash Indian non-coking coal to 17 wt% through a sink-float method did not decrease the complex viscosity of this coal but reduced the maximum mobility of the fluid H to levels observed with the lower ash content (20 wt%) Indian coal. Therefore, this reduction in mobility could be directly related to the mineral matter in the Indian non-coking coal.

中文翻译:

了解高灰分印度烟煤的异常流动特性

高温流变仪和 1H 核磁共振 (NMR) 是两种互补技术,已用于定量研究 105 Pa.s 内流动性的发展),流体 H 的最大浓度与优质焦煤的最大浓度非常相似( 40%)。这种印度非焦煤开发出的流体 H 在煤系列中具有最大的流动性(T2L > 150 μs),无论研究的粒度分数如何。这种异常行为的可能解释是矿物质阻止了样品中的整体运动,但流体相的局部流动性在纳米尺度上仍然很高。将两种印度非焦煤与高流动性介质焦煤混合得到比聚合物混合规则预测的更高的粘度(即更低的流动性),可能又是由于高矿物质限制了整体流动。对于高灰分煤,这种负面影响不太明显,这表明这种煤中流体实体的高流动性可能会阻止从中等焦煤中析出的流体实体的破坏。通过沉浮法将高灰分印度非焦煤部分脱矿至 17 wt% 并没有降低这种煤的复数粘度,但将流体 H 的最大流动性降低到在较低灰分含量(20 wt%)下观察到的水平%) 印度煤炭。因此,这种流动性的降低可能与印度非焦煤中的矿物质直接相关。对于高灰分煤,这种负面影响不太明显,这表明这种煤中流体实体的高流动性可能会阻止从中等焦煤中析出的流体实体的破坏。通过沉浮法将高灰分印度非焦煤部分脱矿至 17 wt% 并没有降低这种煤的复数粘度,但将流体 H 的最大流动性降低到在较低灰分含量(20 wt%)下观察到的水平%) 印度煤炭。因此,这种流动性的降低可能与印度非焦煤中的矿物质直接相关。对于高灰分煤,这种负面影响不太明显,这表明这种煤中流体实体的高流动性可能会阻止从中等焦煤中析出的流体实体的破坏。通过沉浮法将高灰分印度非焦煤部分脱矿至 17 wt% 并没有降低这种煤的复数粘度,但将流体 H 的最大流动性降低到在较低灰分含量(20 wt%)下观察到的水平%) 印度煤炭。因此,这种流动性的降低可能与印度非焦煤中的矿物质直接相关。通过沉浮法将高灰分印度非焦煤部分脱矿至 17 wt% 并没有降低这种煤的复数粘度,但将流体 H 的最大流动性降低到在较低灰分含量(20 wt%)下观察到的水平%) 印度煤炭。因此,这种流动性的降低可能与印度非焦煤中的矿物质直接相关。通过沉浮法将高灰分印度非焦煤部分脱矿至 17 wt% 并没有降低这种煤的复数粘度,但将流体 H 的最大流动性降低到在较低灰分含量(20 wt%)下观察到的水平%) 印度煤炭。因此,这种流动性的降低可能与印度非焦煤中的矿物质直接相关。
更新日期:2018-07-01
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