白松木屑半焦与褐煤共气化过程中的协同效应

用环氧树脂E12为基体,配合酚类固化剂及其他助剂,经熔融共混制备出低温固化环氧粉末涂料。考察了固化剂、促进剂用量等对体系固化性能、附着力及耐冲击性的影响,并通过非等温差示扫描量热法及红外光谱研究了酚羟基/环氧体系的固化反应。实验结果表明:随着固化剂用量增加,涂膜耐冲击性能先提高后减小;随着促进剂用量的增加,体系固化温度降低,附着力和耐冲击性提高。固化剂、促进剂最佳用量分别为环氧树脂E-12用量的20%和2.0%。

Synergy Effect in Co-Gasification of Lignite and Char of Pine Sawdust

Pine sawdust was torrefied at 200, 300, and 400 ℃ in a muffle furnace, and used with Shengli lignite for co-gasification. Fourier transform infrared (FTIR) spectroscopy indicated that the pine sawdust torrefied at 200 and 300 ℃ contained the functional groups C―O―, ―CH₃, and ―OH, while the pine sawdust torrefied at 400 ℃ was similar to lignite, containing the functional groups ―C=C―, ―C=O, and ―OH. That is, when the torrefaction temperature of the pine sawdust increased, the single bonds in functional groups were converted to double bonds. After torrefaction, individual gasification and co-gasification of the lignite and pine sawdust chars were studied and compared in a thermogravimetric analyzer and fixed-bed reactor. It was found that both experimental results were consistent. The gas yield of pine sawdust char by individual gasification was higher when the pretreatment temperature was increased. Co-gasification of pine sawdust torrefied 200 and 400 ℃ with lignite had a positive effect on the product gas yield, carbon conversion, and synergetic efficiency, and the synergetic effects for sawdust torrefied at 200 ℃ were less than those for sawdust torrefied at 400 ℃. In contrast, pine sawdust torrefied at 300 ℃ had some inhibitory effects for co-gasification with lignite. Considering both the thermogravimetric analysis and fixed bed experiments, it is concluded that the synergetic effects can be attributed to the alkali metal and the hydrogen atomin the pine sawdust chars occurring at the pyrolysis stage.