In-Situ Reforming of Tar from the Rapid Pyrolysis of a Brown Coal over Char
In-Situ Reforming of Tar from the Rapid Pyrolysis of a Brown Coal over Char
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DOI：
10.1021/ef9005109
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发表时间：
2010-01
期刊：
影响因子：
5.3
通讯作者：
T. Matsuhara;S. Hosokai;K. Norinaga;K. Matsuoka;Chun-Zhu Li;J. Hayashi
中科院分区：
文献类型：
--
作者：
T. Matsuhara;S. Hosokai;K. Norinaga;K. Matsuoka;Chun-Zhu Li;J. Hayashi
在750 - 900 °C下，研究了褐煤快速热解产生的新生焦油在由相同煤制备的焦炭上的重整。重整是非常快速和广泛的，仅允许苯（0.02%，基于煤C）、萘（0.001%）和菲（0.0001%）分别在小于170 ms和900 °C的空床气体停留时间下从炭床逸出。即使在750 °C下重整也将96%的重质焦油（沸点温度>336 °C）转化为不凝气体和焦炭存款在焦炭上。随着温度的升高，焦油转化为焦炭的转化率降低，这表明焦油在焦炭的焦化和蒸汽气化的顺序中进行重整，而不是在焦炭上直接进行蒸汽重整。在900 °C下的重整由于焦炭/炭气化的进展快于焦炭沉积而产生负焦炭产率。结果表明，即使在无氧条件下，通过加强煤焦与挥发分之间的接触，也有可能实现焦油的完全重整。
Reforming of nascent tar from the rapid pyrolysis of a brown coal over char prepared from the same coal was studied at 750−900 °C. The reforming was very rapid and extensive, allowing only benzene (0.02% on a coal C basis), naphthalene (0.001%), and phenanthrene (0.0001%) to escape from the char bed at an empty-bed gas residence time of less than 170 ms and 900 °C, respectively. Reforming even at 750 °C converted 96% of heavy tar (boiling point temperature >336 °C) into noncondensable gases and coke deposit over the char. Decreasing conversion of the tar into coke with increasing temperature suggested that the tar was reformed in a sequence of coking and steam gasification of the coke rather than direct steam reforming over the char. The reforming at 900 °C gave a negative coke yield due to progress of coke/char gasification faster than the coke deposition. Results of this work thus showed a possibility of complete tar reforming by intensification of contact between the char and volatiles even in the abse...