东胜和Yallourn褐煤等温热解煤气的性质

PROPERTIES OF PYROLYSIS GAS FROM DONGSHENG LIGNITE AND YALLOURN LIGNITE UNDER ISOTHERMAL HEATING CONDITIONS

以内蒙东胜褐煤和澳大利亚Yallourn褐煤为研究对象,应用红外光谱对其主要分子结构进行分析,并进行了等温热解实验.主要对比考察了等温热解温度对两种褐煤热解气组成、产量和热值的影响.结果表明,两种褐煤的脂肪烃类结构及含氧官能团比较多;随着等温热解温度的升高,CO和H2的含量(体积分数)增加,CO2的含量(体积分数)明显减少,热解气的产量和热值增加;东胜褐煤热解过程中获得的H2量较高,更适合作为热解制氢的原料.相同热解温度下,等温热解与程序升温相比,得到的煤气热值高,是一种比较有效的获得高热值的热解方法.

The infrared spectroscopy and isothermal heating pyrolysis experiment were performed to study the main molecular structure and pyrolysis characteristics of Dongsheng and Yallourn lignite. The main work was done to investigate the influence of pyrolysis temperature on pyrolysis gas composition, gas yield and gas heating value. The results show that both lignites had abundant aliphatic hydrocar structure and oxygen containing functional groups. The content of CO and H2 increase gradually with the increasing of pyrolysis temperature, and CO2 content of gas reducing dramatically. The calorific value and yield of the gas increased accordingly. During the pyrolysis, Dongsheng lignite have a higher yield of H2, and it is more suitable as raw material for hydrogen production. Under the same temperature, the calorific value of pyrolysis gas ob- tained from isothermal heating is higher than that of programmed temperature.