两种加热方式下玉米芯-褐煤共热解产物的特性
Characteristics of co-pyrolysis products of corncob-lignite under two heating modes
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摘要: 采用微波和低温固定床2种加热方式, 对不同配比下的玉米芯-褐煤混合物的共热解产物特性进行了研究。结果表明, 当玉米芯配入量为30%时, 2种加热方式下的焦油产率均达到最大值, 其中微波加热下的焦油产率最大为16.31%, 比低温加热 (11.70%) 提高了39.40%。对热解焦油进行GC-MS检测, 发现添加30%玉米芯后, 微波加热下的脂肪族和酚类含量分别比低温加热提高了8.41%和16.12%, 杂原子含量降低了34.51%, 实现了微波加热下焦油更大程度的高品质化。对热解半焦进行SEM分析, 发现微波加热下的共热解半焦表面较低温加热下变得更粗糙, 裂纹更丰富。Abstract: The characteristics of co-pyrolysis products of corncob-lignite with different ratios were studied under two heating modes, which called microwave and low temperature fixed bed.The results showed that when the corncob content was 30%, the tar yield under both heating modes reached the maximum, and the tar yield under the microwave heating was 16.31%, which was 39.40% higher than the low temperature heating (11.70%).The results of GC-MS showed that the content of aliphatic and phenol in microwave heating increased by 8.41% and 16.12%, while the content of heteroatom decreased by 34.51%, compared to low temperature heating, respectively, with the addition of 30% corncob, which achieved a high-quality tar generation.The SEM analysis of pyrolysis char showed that the surface of co-pyrolysis char under microwave heating became more rough, and there was an more abundant crack than the low temperature heating.