三种不同变质程度煤的快速热解特性研究

Study on rapid pyrolysis characteristics of coal of three different metamorphic grades

为了研究不同变质程度煤快速热解产物的特性,利用热重分析仪、热裂解-气相色谱-质谱(Py-GC-MS)在线联用技术及傅里叶红外光谱(FT-IR)研究了不同变质程度煤快速热解气相产物分布及固体产物焦炭中含氧官能团的变化规律。结果表明,三种不同变质程度煤热解过程中,不黏煤总失重量最大;热解焦油中脂肪烃含量最高的是不黏煤热解焦油(摩尔分数11%),芳香烃含量最高的是肥煤热解焦油(摩尔分数73%),含氧化合物含量最高的是气煤热解焦油(摩尔分数31%);综合FT-IR及Py-GC-MS结果可知,煤中羟基热解生成CO_(2)气体,甲基和亚甲基热解生成轻质烃类。

To study the rapid pyrolysis characteristics of coal of different metamorphic grades,the distributions of rapid pyrolysis gaseous products and the variation rules of the oxygen-containing functional group of solid product coke of the coal of different metamorphic grades were characterized by thermogravimetric analysis,pyrolysis gas chromatography mass spectrometry(Py-GC-MS),and Fourier transform infrared spectrometry(FT-IR).The results showed during the pyrolysis processes of the three coals,the total weight loss of non-caking coal was the highest.And the content of aliphatic compounds in pyrolytic tar of non-caking coal was the highest(mole fraction 11%),the content of aromatics in the pyrolytic tar of fat coal was the highest(mole fraction 73%),and the content of oxygen-containing compounds in the pyrolytic tar of gas coal was the highest(mole fraction 31%).Based on the results of FT-IR and Py-GC-MS,the pyrolysis of hydroxyl groups in coal generated CO2 and the pyrolysis of methyl and methylene groups produced light hydrocarbons.