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林产化学与工业 ›› 2018, Vol. 38 ›› Issue (4): 95-102.doi: 10.3969/j.issn.0253-2417.2018.04.015

• 研究报告 • 上一篇    下一篇

CO2/N2气氛下的褐煤和沙柳共热解特性及动力学研究

宫聚辉, 邵婷婷, 王克冰   

  1. 内蒙古农业大学 理学院, 内蒙古 呼和浩特 010018
  • 收稿日期:2018-01-16 出版日期:2018-08-25 发布日期:2018-08-10
  • 通讯作者: 王克冰,教授,硕士生导师,研究方向为生物质能源化工;E-mail:wkb0803@163.com。 E-mail:wkb0803@163.com
  • 作者简介:宫聚辉(1994-),女(满族),内蒙古赤峰人,硕士生,研究方向为生物质和煤的能源化转化及利用;E-mail:924775103@qq.com
  • 基金资助:
    国家自然科学基金资助项目(21366018)

Characterization and Kinetic of Co-pyrolysis of Coal and Salix Under CO2/N2 Atmospheres

GONG Juhui, SHAO Tingting, WANG Kebing   

  1. College of Science, Inner Mongolia Agricultural University, Huhhot 010018, China
  • Received:2018-01-16 Online:2018-08-25 Published:2018-08-10

摘要: 利用综合热分析仪分别对胜利褐煤、生物质(沙柳)以及二者以不同比例(1∶4,5∶5,4∶1)混合后的试样在不同的CO2/N2(1∶4,5∶5,4∶1)气氛条件下的热解失重行为进行研究,并观察褐煤与沙柳在共热解反应过程中的相互作用,应用Coats-Redfern方法分析热解反应。实验结果表明:褐煤与沙柳主要热解温度段有相互重叠的部分,且存在相互作用,当V(CO2)∶V(N2)=5∶5时,褐煤与沙柳混合物在热解高温段全部表现为促进作用,且促进作用随沙柳含量的增加越来越弱。当m(煤)∶m(沙柳)=5∶5时,不同CO2/N2比例气氛下热解的高温段中CO2气氛比例越大,煤与沙柳的相互促进作用越强。活化能的范围均在15 ~70 kJ/mol之间,且沙柳的活化能比煤的大;高温段所需的活化能较低温段的大;CO2/N2气氛比例及沙柳/煤混合比例均对活化能和指前因子有一定的影响。当V(CO2)∶V(N2)=5∶5时,随着混合物中沙柳的增加,混合物的活化能和指前因子先增后降;当m(煤)∶m(沙柳)=5∶5时,随着CO2/N2混合气氛中CO2的增加,混合物的活化能和指前因子的变化趋势也先增加后降低。

关键词: 褐煤, 沙柳, 动力学, 热重分析, 相互作用

Abstract: The pyrolysis of coal,Salix psammophila and mixture of salix and coal(mass ratio coal of salix 1:4,5:5,4:1) under different V(CO2):V(N2) (1:4,5:5,4:1) atmosphere were analyzed by using temperature programmed thermogravimetric analysis. Pyrolysis kinetic parameters were obtained by Coats-Redfern method after the experiment. The interaction between salix and coal were studied. The experimental results showed that the two main pyrolysis temperature sections overlapped each other.When V(CO2):V(N2) was 5:5, the co-pyrolysis of coal and salix with different blends of coal and salix mixtures had promoting effect and the effect was weaker and weaker with the increase of the content of salix. When m(coal):m(salix) was 5:5, the larger the proportion of CO2 atmosphere under different atmosphere proportion at high temperature pyrolysis was, the stronger the interaction between Salix psammophila and coal was. The pyrolysis kinetics analysis by Coats-Redfern method showed that the activation energies were 15-70 kJ/mol, and the activation energy of salix was higher than that of coal. The activation energy required for the high temperature section was greater than that for the low temperature section. Both the CO2/N2 atmosphere ratio and the salix/coal ratio had a certain influence on the activation energy and pre-exponential factors. When V(CO2):V(N2) was 5:5, with the increase of salix in the mixture, and when m(coal):m(salix) was 5:5, with the increase of CO2, the activation energy of the mixture and the change trend of the pre-exponential factor both increased first and then decreased.

Key words: coal, salix, kinetics, thermal gravimetric analysis, interaction effect

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