学术论文

      木质素热解气相产物释放特性实验研究

      Experimental Study on GasProduct Release Characteristics of Lignin Pyrolysis

      摘要:
      利用热重红外分析仪(TG-FTIR)对木质素进行热重分析及主要气相产物分析,结合红外光谱对木质素不同热解阶段生成的半焦进行研究.实验结果表明:木质素热解分为3个阶段,200℃以下为自由水挥发过程;200~550℃为主要热解阶段,此过程中木质素苯环周围的官能团发生断裂,析出部分气体产物及焦油产物;550~900℃过程中,苯环发生解链或芳香缩聚成碳.通过FTIR的研究发现,木质素热解过程中,析出的主要气体包括H2O、CO2、CO以及烃类产物CH4等,CO2析出存在2个温度区间低温段(250~450℃)和高温段(650~750℃),而 CO 在高温段大量生成,CH4的析出主要集中在在300~600℃温度区间.
      Abstract:
      Thermogravimetric analysis-Fourier transform infrared spectromerer (TG-FTIR) was applied to analyze the thermogravimetric and main gas products of alkali lignin pyrolysis,combined with infrared spectroscopy study of the chars from lignin pyrolysis generated different stages. The results show that the pyrolysis of lignin is divided into three phases:the moisture is volatilized below 200℃.Primary pyrolysis stage occurs at 200~550℃,the functional groups of lignin around phenyl ring broke and generated part of the gas and tar products. At 550~900℃,benzene or aromatic condensed into carbon. It is found that the primary gas releases from the process of lignin pyrolysis,mainly including H2O,CO2,CO,CH4 and other hydrocarbons.CO2 product releases at lower temperature (250~450℃)and higher temperature section (650~750℃), and an amount of CO releases at much higher temperature. In contrast,a large amount of CH4 mainly releases in the temperature range of 300~600℃.
      作者: 车德勇 [1] 孙艳雪 [1] 孙佰仲 [2] 李少华 [1]
      Author: CHE Deyong [1] SUN Yanxue [1] SUN Baizhong [2] LI Shaohua [1]
      作者单位: 东北电力大学能源与动力工程学院,吉林省吉林市,132012 中国大唐集团科学技术研究院,北京市西城区,100033
      刊 名: 中国电机工程学报 ISTICEIPKU
      年,卷(期): 2015, 35(24)
      分类号: TK6
      在线出版日期: 2016年2月25日