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林产化学与工业 ›› 2018, Vol. 38 ›› Issue (2): 119-125.doi: 10.3969/j.issn.0253-2417.2018.02.016

• 研究报告 • 上一篇    下一篇

茶梗的热解特性及动力学研究

郭先华, 张建育, 湛方栋, 何永美, 李博, 蒋明   

  1. 云南农业大学 资源与环境学院, 云南 昆明 650201
  • 收稿日期:2017-09-08 出版日期:2018-04-25 发布日期:2018-04-28
  • 通讯作者: 蒋明(1981-),男,讲师,博士,主要从事农业环境材料的研究;E-mail:mingjiang2010@163.com。 E-mail:mingjiang2010@163.com
  • 作者简介:郭先华(1974-),男,湖北宜昌人,副教授,博士,主要从事能源工程研究;E-mail:gxher@163.com
  • 基金资助:
    国家自然科学基金资助项目(41461117,51768074);云南农业大学科研启动基金项目(A2002350)

Thermal Decomposition Characteristics and Kinetics of Tea Stalk

GUO Xianhua, ZHANG Jianyu, ZHAN Fangdong, HE Yongmei, LI Bo, JIANG Ming   

  1. College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China
  • Received:2017-09-08 Online:2018-04-25 Published:2018-04-28

摘要: 为综合利用茶梗废弃物,采用同步热重-差热分析法(TG-DTA)研究了茶梗的热解过程及动力学。结果表明:在氮气气氛下不同升温速率茶梗样品的TG-DTG-DTA曲线中,茶梗的热失重过程可分为5个阶段,主分解反应发生在第三、四阶段,在4种不同的升温速率(10、15、20和25 K/min)下,这两个阶段的平均失重率分别为55.12%和28.48%,且均表现为放热过程;随着升温速率的增大,第四阶段分解反应向高温区域移动。采用Kissinger法、FWO峰值转化率近似相等法、FWO等转化率法分别计算了茶梗的热解动力学参数。结果显示:Kissinger法和FWO峰值转化率近似相等法更适用于动力学参数的求解,两种方法得到的表观活化能分别为666.53和642.80 kJ/mol;Kissinger法计算得到的指前因子对数值lnA=145.83。

关键词: 茶梗, 热解, 动力学, 氮气气氛

Abstract: In order to provide comprehensive utilization of tea stalk waste by thermochemical conversion, the thermal decomposition process of tea stalk and its kinetics were studied with simultaneous measurements of thermogravimetry (TG)/differential thermal analysis (DTA). The TG-DTG-DTA curves of tea stalk were acquired in a nitrogen atmosphere. The results indicated that the mass loss process of the samples could be divided into five stages. Among the five stages, most of the decomposition occurred in the third and fourth stages. The two main stages were indicated as exothermic processes, with the average weight loss rates of 55.12% and 28.48% at different heating rates of 10, 15, 20, 25 K/min, respectively. At higher heating rate, the fourth stage of the decomposition reaction was shifted to higher temperature range. The thermal decomposition kinetic parameters were calculated by Kissinger, FWO peak maximum evolution and FWO isoconversional methods. The results showed that the Kissinger and FWO peak maximum evolution methods were more suitable for the thermal decomposition kinetic parameters. The apparent activation energies were calculated to be 666.53 and 642.80 kJ/mol by the two methods, respectively. And natural logarithm of the pre-exponential factor (lnA) calculated by Kissinger method was given as 145.83.

Key words: tea stalk, thermal decomposition, kinetics, nitrogen atmosphere

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