神华煤液化残渣的热解特性研究

以N2为载气，流速为20 mL/min，升温速率分别为15,30,45和60 ℃/min，终温1 200 ℃ 的条件下，用TGA/SDTA851热失重分析仪进行了神华煤液化残渣的热解特性试验研究.实验得到了神华煤液化残渣热解的TG和DTG曲线，表明神华煤液化残渣的热解是分两步进行的.在低温段主要是神华煤液化残渣中挥发性的气体溢出引起热解失重；高温段则主要是一些高分子有机质的热解过程.低温段的热解是主要的，它基本上热解掉了神华煤液化残渣重量的30%~40%.神华煤液化残渣挥发分含量很高且具有集中析出的特性，在240~370 ℃区间内可挥发物质迅速热解完毕.其在高温段的热解产率很小，只有总重量的10%~13%.随着升温速率的增加，低温段和高温段热解的区分更加明显，且使神华煤液化残渣的热解产率提高.此外,还给出了不同升温速率下的神华煤液化残渣热解特性数据和化学反应动力学参数.

Study on pyrolysis property of Shenhua coal liquefaction residual

Shenhua coal liquefaction residual samples were pyrolysed using TGA/SDTA851 thermogravimetric analyzer. The pyrolysis process of the coal liquefaction residual was investigated under a neutral atmosphere of N2 at the sweep rate of 20 mL/min, in which linear heating rate was 15,30,45,60 ℃/min and the final pyrolysis temperature was 1 200 ℃. The results prove that the pyrolysis process of Shenhua coal liquefaction residual is divided into two steps, low temperature step and high temperature step. In low temperature step, main reaction is release of volatile matters, up to 30%~40% of weight loss to the sample. In the low temperature range of 240~370 ℃, most of volatile matters are released. In the high temperature step, the pyrolysis of macromolecular compounds occurs, only about 10%~13% of weight loss to the sample. Some chemical reaction kinetic parameters and pyrolysis properties of coal liquefaction residual were got under different heating rates. Pyrolysis rate of coal liquefaction residual increases with increasing heating rate.