神华煤直接液化残渣热解特性研究

通过热重分析技术考察了神华煤直接液化残渣的热解特性。结果表明，和煤热解相比，在相同条件下残渣热解具有更大的失重率和失重速率。残渣热失重分为三个阶段，在173℃以前为残渣热解第一阶段;从173℃～510℃是残渣热解第二阶段，此阶段为残渣的主要失重阶段；510℃以后是残渣热解的第三阶段，在这个阶段残渣继续失重，此阶段的失重是由于残渣的二次分解和残渣中的矿物质分解造成的。通过比较脱油前后残渣热失重曲线发现，残渣主要失重是由于残渣中重质油、沥青烯以及前沥青烯的热解以及挥发造成的。通过脱灰残渣的热解发现，与原残渣相比，脱灰后残渣的失重量变小，矿物质的分解和残渣中有机组分的缩聚是温度高于649℃以后残渣失重的主要原因。由热解特征参数看出，脱油残渣的初始热解温度、最大失重温度以及剧烈热解终温均高于原煤，说明和原煤相比，脱油后残渣中惰性组分不易热解。与原煤和四氢呋喃脱油渣相比，残渣具有最大的失重速率，这是由于残渣中含有大量重质油、沥青烯以及前沥青烯造成的。

Pyrolysis characteristics of Shenhua direct liquefaction residue

The pyrolysis characteristic of Shenhua coal and Shenhua direct liquefaction residue was studied using TG method. It is found that compared with coal, the weight loss and weight loss rate of residue are higher. The weight loss process of residue can be divided into three stages: the first is before the temperature of 173℃; the second is from 173℃ to 510℃, in which the higher weight loss is due to the pyrolysis and volatilization of oil, asphaltene and preasphaltene in residue; the third is after 510℃, in which the weight loss is continuing. Compared with the TG and DTG curve of THF extracted residue, it is found that the majority of weight loss of residue is due to the volatilization and pyrolysis of heavy oil; and compared with the TG and DTG curve of acid washed residue, it is noted the weight loss after 649℃ is mainly due to the decomposition of mineral matter and the cracking of organic compound.