茶梗的热解特性及动力学研究

doi:10.3969/j.issn.0253-2417.2018.02.016

Abstract

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

CLC Number:

TQ35
S216.2

GUO Xianhua, ZHANG Jianyu, ZHAN Fangdong, HE Yongmei, LI Bo, JIANG Ming. Thermal Decomposition Characteristics and Kinetics of Tea Stalk[J]. Chemistry and Industry of Forest Products, 2018, 38(2): 119-125.

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Thermal Decomposition Characteristics and Kinetics of Tea Stalk

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