Dong Heming, Zhang Yu, Du Qian, Li Dun, Feng Dongdong, Gao Jianmin, Wu Shaohua, Luan Jiyi
School of Energy Science and Engineering, Harbin Institute of Technology, 92, Xidazhi Street, Harbin, Heilongjiang 150001, China.
School of Mechanical Engineering, Jiamusi University, 258, Xuefu Street, Jiamusi, Heilongjiang 154007, China.
ACS Omega. 2020 Apr 17;5(16):9078-9092. doi: 10.1021/acsomega.9b03441. eCollection 2020 Apr 28.
In this work, two series of brown coals (including acid-washed coal and ion-exchangeable Na-loaded coal) were pyrolyzed in a drop-tube reactor. The experimental results revealed that soot and tar yields of Na-loaded coals were significantly lower than that of acid-washed coals. Gasified Na can reduce the formation of big soot agglomerates. During coal primary pyrolysis, ion-exchangeable Na can reduce the amount and aromaticity of primary tar. Na released with volatiles can catalyze the cracking of aliphatic and aromatic compounds, inhibit the polymerization between aromatic rings, and promote the combination of soot/tar with oxygen-containing substances, resulting in the decrease of graphite crystallite size and the increase of amorphous carbon content. Na can also reduce the organization degree of soot by forming intercalation compounds.
在本研究中，将两组褐煤（包括酸洗煤和离子交换型载钠煤）在沉降炉中进行热解。实验结果表明，载钠煤的 soot 和焦油产率明显低于酸洗煤。气化的钠可减少大的 soot 团聚体的形成。在煤的初次热解过程中，离子交换型钠可减少初次焦油的量和芳香性。随挥发物释放的钠可催化脂肪族和芳香族化合物的裂解，抑制芳环之间的聚合，并促进 soot/焦油与含氧化合物的结合，导致石墨微晶尺寸减小和无定形碳含量增加。钠还可通过形成插层化合物降低 soot 的有序度。
