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林产化学与工业 ›› 2016, Vol. 36 ›› Issue (4): 31-40.doi: 10.3969/j.issn.0253-2417.2016.04.005

• 研究报告 • 上一篇    下一篇

棕榈壳热解失重特性及动力学研究

常国璋1,2, 黄艳琴1, 谢建军1, 阴秀丽1, 吴创之1   

  1. 1. 中国科学院广州能源研究所;中国科学院可再生能源重点实验室, 广东 广州 510640;
    2. 中国科学院大学, 北京 100039
  • 收稿日期:2015-08-20 出版日期:2016-08-25 发布日期:2016-09-01
  • 通讯作者: 黄艳琴(1983-),副研究员,硕士生导师,主要从事生物质热化学转化研究;E-mail:huangyq@ms.giec.ac.cn。 E-mail:huangyq@ms.giec.ac.cn
  • 作者简介:常国璋(1986-),男,山东章丘人,博士生,主要从事生物质高效气化工艺研究;E-mail:changgz@ms.giec.ac.cn
  • 基金资助:
    国家自然科学基金资助项目(51176194);广东省战略新兴产业项目(2012A032300019)

Kinetic Analysis of Palm Kernel Shell during Pyrolysis Reaction

CHANG Guo-zhang1,2, HUANG Yan-qin1, XIE Jian-jun1, YIN Xiu-li1, WU Chuang-zhi1   

  1. 1. Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
    2. University of Chinese Academy of Sciences, Beijing 100039, China
  • Received:2015-08-20 Online:2016-08-25 Published:2016-09-01

摘要: 采用热重-红外联用(TG-FTIR)、裂解-气相色谱/质谱联用(Py-GC/MS)技术和小型固定床装置,考察了棕榈壳的热解失重过程和产物特性,并进一步评价了热解半焦的气化反应性。结果表明:棕榈壳热解失重过程大致分为干燥(25~236℃,3.42%)、主失重(236~400℃,52.31%)和炭化(400~850℃,14.90%)3个阶段,1.5级或2级反应可以较好描述棕榈壳热解反应的主失重过程;升温速率10~30 K/min下,反应表观活化能为67.63~76.47 kJ/mol;热解过程主要气体产物的释放量顺序分别为CO2、H2O、CH4和CO;600~850℃下,棕榈壳主要热解产物为液相产物,其质量产率36.8%~50.9%,能量产率41.3%~58.9%,主要组分包括苯酚、乙酸、十八烷酸、十六烷酸、4-烯丙基-2,6-二甲氧基苯酚等物质,其中苯酚GC含量较高(12.56%~15.49%),这可能主要与原料木质素的含量较高有关;固相产物的质量和能量产率分别为20.6%~26.7%和27.4%~35.0%,其CO2气化反应性相对低于稻秆、木粉等常见生物质。

关键词: 棕榈壳, 热解, 产物特性, CO2气化反应性, 动力学

Abstract: The pyrolysis characteristics, mechanism, and products properties of palm kernel shell (PKS) in a bench-scaled fixed bed reactor were investigated by using thermogravimetry-Fourier transform infrared spectroscopy (TG-FTIR), pyrolysis-gas chromatography and mass spectrometry (Py-GC/MS). TG results showed that the pyrolysis of PKS could be devided into three steps, which included drying(25-236℃, 3.42%), main weight loss(236-400℃, 52.31%), and carbonization (400-850℃, 14.90%) stage. The main mass loss stage of PKS pyrolysis was controlled by 1.5 or 2 order reaction model, and the apparent activation energies at heating rates of 10-30 K/min were 67.63-76.47 kJ/mol. The gaseous products were evolved with the sequence of CO2, H2O, CH4, and CO. The quantitative results showed that liquid was the primary pyrolysis product at 600-850℃, with the mass yield of 36.8%-50.9% and energy yield of 41.3%-58.9% according to original material. Py-GC/MS results indicated that the main components of liquid products were phenol, acetic acid, octadecanoic acid, n-hexadecanoic acid, 4-allyl-2,6-dimethoxyphenol, etc.. It was notable that phneols had a higher relative content, accounting for about 12.56%-15.49%. Biochar was an important by-product of PKS pyrolysis, with the mass and energy yield of 20.6%-26.7% and 27.4%-35.0%, respectively. The CO2 gasification reactivity of PKS char was lower than that of rice straw char and wood char.

Key words: palm kernel shell, pyrolysis, products characteristics, CO2 reactivity, kinetics

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