热解温度对东胜褐煤等温热解的影响

Effect of pyrolysis temperature on isothermal decomposition of Dongsheng lignite

对东胜褐煤进行等温热解试验,分析热解温度对褐煤热解气的组成、产量和热值的影响,并利用FTIR对褐煤及其热解产物半焦的主要分子结构进行分析。结果表明,随着等温热解温度的升高,褐煤热解产物半焦中脂肪烃类结构及含氧官能团减少;热解气中CO和H2的含量逐渐增加,CO2的含量明显降低,CH4和CnHm的含量先增加后减少,热解气的产量和热值明显增加;当热解温度为700℃时可得到较高热值的热解气,此时φ(H2)高达39.5%。

The isothermal pyrolysis experiment was performed on Dongsheng lignite to study the effect of pyrolysis temperature on compositions,yield and calorific value of pyrolysis gas.The main molecular structures of coal and semicoke were studied by FTIR.The results show that with the increase of pyrolysis temperature,aliphatic hydrocarbon structures and oxygen containing functional groups in the semicoke decrease,CO and H2 content in the pyrolysis gas gradually increase,CO2 content in the pyrolysis gas obviously decreases,and the yield and calorific value of pyrolysis gas significantly increase.Meanwhile,CH4 and CnHmcontent in the pyrolysis gas increase firstly and then decrease.The higher calorific value gas can be obtained under the pyrolysis temperature of 700 ℃,whileφ（H2）reaches up to 39.5%.