Co-liquefaction behavior of a sub-bituminous coal and sawdust
Co-liquefaction behavior of a sub-bituminous coal and sawdust
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次烟煤与锯末的共液化行为
DOI：
10.1016/j.energy.2011.08.046
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发表时间：
2011-11
期刊：
影响因子：
9
通讯作者：
李海平
中科院分区：
文献类型：
--
作者：
水恒福;单传俊;蔡振益;王知彩;雷智平;任世彪;潘春秀;李海平
研究了神华煤与木屑的共热解和共液化特性。探讨了神华煤与木屑在共液化过程中的协同作用。TG/DTG分析表明，具有较低热解温度的锯末能够促进神华煤的热解，导致煤分子结构在共热解过程中释放出更多的挥发物。这将导致其混合物的重量损失比相应的单个热解加权平均值更大。神华煤和木屑的单独液化实验表明，木屑的液化活性高于神华煤。在相同的液化条件下，神华煤的液化转化率和产油率明显高于神华煤。对神华煤和木屑在不同条件下进行了共液化。结果表明，在共液化过程中存在明显的协同效应，这种协同效应是液化条件的函数。在较高的液化温度和较长的反应时间下，由于煤的液化活性增加，体系的供氢能力不足，协同效应减弱，导致退缩反应速率增加。在煤/木屑配比为1/1的共液化条件下，与神华煤和木屑各自液化的计算加权平均值相比，在400℃和380℃下的转化率和产油率分别提高了16.8%和11.4%。
The co-thermolysis and co-liquefaction properties of Shenhua coal and sawdust were investigated in this study. The synergistic effect between Shenhua coal and sawdust in co-liquefaction was probed. TG/DTG analysis suggests that the sawdust, which has lower pyrolysis temperature, can promote the thermolysis of Shenhua coal, resulting in more volatile matter to be released from coal molecular structure during the co-thermolysis process. This will result in the larger weight losses of their mixture compared to the corresponding weighted mean values of individual pyrolysis. The individual liquefaction of Shenhua coal and sawdust shows that sawdust has higher liquefaction activity compared to Shenhua coal. It gives much higher liquefaction conversion and oil yield than Shenhua coal at the same liquefaction conditions. Co-liquefactions of Shenhua coal and sawdust at different conditions were carried out. The results suggest that there exists an obviously synergistic effect during the co-liquefaction, and this synergistic effect is the function of liquefaction conditions. At high liquefaction temperatures and long reaction times, the synergistic effect decreases because of the increase of liquefaction activity of coal and lack of hydrogen donating ability of the system at the conditions, resulting in the increase of the rate of retrogressive condensed reactions. The largest enhancements in conversion of 16.8% and oil yield of 11.4% comparing with corresponding calculated weighted mean values of the individual liquefaction of Shenhua coal and sawdust were obtained at 400 and 380 °C, respectively in the co-liquefaction with 1/1 blending ratio of coal/sawdust.
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