摘要
本文利用热重分析仪,研究了升温速率(100、300、500℃·min^(-1))和粒径(0.50~1.00mm、0.280~0.50mm、0.150~0.280mm、0.071~0.150mm和<0.071mm)对神木煤快速热解特性的影响及其热解动力学。结果表明,随着升温速率增大,煤样的TG(Thermal Gravity Analysis)与DTG(Differential thermal gravity)曲线均出现“热滞后现象”。不同粒径的煤样在100℃·min^(-1)的升温速率下热解时,随着粒径增大,挥发分产率增加,焦炭产率降低。采用FWO、Friedman和DAEM这3种方法进行计算,得到的热解反应的平均活化能,分别为319.95、325.54、305.55k J·mol^(-1),实验结果可为煤热解反应器的优化提供重要依据。
In this paper, the effects of heating rate and particle size on flash pyrolysis behavior of Shenmu coal and its pyrolysis kinetics were studied by thermal gravimetric(TG) analyzer. The results showed that the TG and DTG curves of the coal sample showed “thermal hysteresis” with the increase of heating rate. When coal samples of different particle sizes were pyrolyzed at a heating rate of 100℃/min, volatile yield increased and coke yield decreased with the increase of particle size. The average activation energy of pyrolysis reaction calculated by FWT, Friedman and DAEM methods were 319.95 kJ/mol, 325.54kJ/mol and 305.55kJ/mol, respectively, which provided an important reference for the optimization of coal pyrolysis reactor.
作者
张凯
刘俊杰
张君涛
牛犇
钟汉斌
ZHANG Kai;LIU Junjie;ZHANG Juntao;ZHONG Hanbin;NIU Ben(Engineering Research Center of Low Carbon Energy&Chemical,College of Chemistry and Chemical Engineering,Xi’an Shiyou University,Xi’an 710065,China)
出处
《化工技术与开发》
CAS
2023年第1期6-12,共7页
Technology & Development of Chemical Industry
基金
陕西省自然科学基础研究计划(2019JLM-1)
国家自然科学基金青年基金项目(21908175)
陕西省重点研发计划项目(2021GY-134)。
关键词
煤热解
快速热解
升温速率
热解动力学
粒径
coal pyrolysis
flash pyrolysis
heating rate
pyrolysis kinetics
particle size
