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首页> 外文期刊>RSC Advances >Effects of poplar addition on tar formation during the co-pyrolysis of fat coal and poplar at high temperature
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Effects of poplar addition on tar formation during the co-pyrolysis of fat coal and poplar at high temperature

机译：高温脂肪煤和杨酸盐分解过程中杨树添加对焦油形成的影响

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Three-stage absorption by butyl acetate was used to obtain tar components during the co-pyrolysis of fat coal and poplar at high temperature. The resulting tar yields were calculated relative to the fat coal and poplar blends. The tar components were characterized by gas chromatography-mass spectrometry, Fourier transform-infrared spectroscopy and H-1 nuclear magnetic resonance spectroscopy. The effects of the added poplar on tar formation were then considered. The results show that the poplar-fat coal tar yield rose slightly when the poplar addition levels ranged from 4% to 12% and then increased much more at higher poplar addition levels. Oxygenated and aromatic compounds contributed greatly to the poplar-fat coal tar yield. The quantity of oxygenated components increased in the poplar blending ratio range from 4% to 12% and decreased as the ratio increased further, while the quantity of aromatic components showed the opposite trend. The influences of poplar addition levels on tar formation could be divided into two stages: (a) lighten the tar by stabilizing radicals at low poplar addition levels; (b) form heavier tar due to cross-linking reactions of the remaining radicals at high poplar addition levels. When the poplar addition levels ranged from 4% to 12%, due to synergistic effects, large amounts of free radicals and hydrogen from the co-pyrolysis of coal and poplar formed lighter stable compounds, which were then transported into the tar. Further, cross-linking reactions could be decreased because fewer free radicals and less hydrogen remained. As a result, the amount of PAHs declined, the tar yield rose slightly, the hydrocarbon-generating potential improved, the aliphatic chain length shortened, and the aromatic protons decreased. At higher blending ratios, excess radicals existed after stabilization due to the increasing poplar addition levels. These radicals underwent cross-linking reactions and produced PAHs, resulting in heavily increased tar yields, weakened hydrocarbon-generating potential, extended aliphatic chain lengths and increased aromatic protons.
机译：乙酸丁酯的三级吸收用于在高温下脂肪煤和杨酸的共热过程中获得焦油组分。相对于脂肪煤和杨树混合物计算所得的焦油产率。通过气相色谱 - 质谱，傅里叶变换 - 红外光谱和H-1核磁共振光谱，表征焦油组分。然后考虑添加杨树对焦油形成的影响。结果表明，当杨树添加水平为4％至12％时，杨树 - 脂肪煤焦油产量略有升高，然后在较高的杨树添加水平上增加更多。氧化和芳族化合物对杨树 - 脂肪煤焦油产量大大贡献。含氧组分的量在杨树混合比的增加范围内的范围为4％至12％，随着比率的进一步增加而降低，而芳族成分的量表现出相反的趋势。杨树添加水平对焦油形成的影响可分为两个阶段：（a）通过在低杨树添加水平下稳定自由基来减轻焦油; （b）由于在高杨树添加水平下的剩余基团的交联反应而形成较重的焦油。当杨树添加水平为4％至12％时，由于协同效应，来自煤和杨树的共热分解的大量自由基和氢气形成较轻的稳定化合物，然后将其转运到焦油中。此外，可以降低交联反应，因为较少的自由基和较少的氢仍然存在。结果，PAHS的量下降，焦油产量略微升高，烃产生电位改善，脂族链长度缩短，芳香族质子减少。在更高的混合比率下，由于杨木添加水平增加，稳定后存在过量的基团。这些自由基接受了交联反应并产生了PAHs，导致焦油产量，烃产生弱化，延伸的脂族链长度和增加的芳族质子增加。

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    《RSC Advances》 |2019年第48期|共8页
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