玉米秸秆水热焦热解及动力学特性研究

doi:10.3969/j.issn.0253-2417.2018.03.011

林产化学与工业 ›› 2018, Vol. 38 ›› Issue (3): 83-89.doi: 10.3969/j.issn.0253-2417.2018.03.011

玉米秸秆水热焦热解及动力学特性研究

董向元, 郭淑青, 杨继涛, 高新杰, 王折折, 王树中

中原工学院能源与环境学院, 河南郑州 450007

收稿日期:2018-01-08 出版日期:2018-06-25 发布日期:2018-06-22
通讯作者: 郭淑青,教授,硕士生导师,主要从事生物质水热资源化利用研究;E-mail:shuqing.guo@163.com。 E-mail:shuqing.guo@163.com
作者简介:董向元(1974-),男,山东文登人,副教授,博士,主要从事生物质水热资源化利用研究
基金资助:
国家自然科学基金资助项目（51206194）；河南省自然科学基金资助项目（182300410108）；河南省高等学校重点科研项目（17A480002）

Pyrolysis and Kinetic Characteristics of Corn Stalk Char from Hydrothermal Carbonization

DONG Xiangyuan, GUO Shuqing, YANG Jitao, GAO Xinjie, WANG Zhezhe, WANG Shuzhong

School of Energy & Environment, Zhongyuan University of Technology, Zhengzhou 450007, China

Received:2018-01-08 Online:2018-06-25 Published:2018-06-22

摘要/Abstract

摘要： 以玉米秸秆为原料制备水热焦，分析了不同反应强度下水热焦碳质量分数的变化规律，并采用Friedman法、Flynn-Wall-Ozawa （FWO）法和Kissenger-Akahira-Sunose （KAS）法，研究了玉米秸秆原料及水热焦（250℃、480 min）的热解过程，计算了其反应活化能。结果表明：在210~290℃，30~480 min反应区间内，玉米秸秆水热焦碳质量分数随水热反应强度增加而增加；水热焦的固体焦产率和热解最大反应速率随水热反应强度增加均呈降低趋势，最大反应速率对应的热解温度区间由280~380℃变为400~450℃，当反应强度超过7.11（250℃、480 min）时，最大反应速率变化相对平稳；玉米秸秆原料及水热焦的热解均可分为脱水、主热解、炭化3个阶段；FWO和KAS模型计算得到的活化能值较为接近，在高转化率阶段（转化率大于20%），水热焦（250℃、480 min）活化能远高于玉米秸秆活化能，当转化率为75%时，通过FWO和KAS法计算得到的水热焦活化能分别为260.87和261.84 kJ/mol，而玉米秸秆的活化能仅为145.55和142.74 kJ/mol。

关键词: 玉米秸秆, 水热焦, 热重, 动力学, 活化能

Abstract: Hydrothermal carbonization experiments were carried out at 180-290℃ for 30-480 min using corn stalk as raw material. The carbon content and pyrolysis characteristics of corn stalk at different reaction conditions were studied. The pyrolysis process and the kinetic parameters of corn stalk and its hydrochar (250℃, 480 min) were investigated using the Friedman method, Flynn-Wall-Ozawa (FWO) method and Kissenger-Akahira-Sunose (KAS) method. The results indicated that the carbon content of corn stalk hydrochar increased with increasing reaction severity. The pyrolysis yield and the maximum reaction rate of the hydrochar decreased gradually, and the pyrolysis temperature range corresponding to the maximum reaction rate varied from 280-380℃ to 400-450℃ with the increase of reaction severity. When the reaction severity was larger than 7.11 (250℃, 480 min), the maximum reaction rate was relatively stable. The thermal decomposition processes of both the corn stalk and its hydrochar could be divided into three stages:dehydration, main pyrolysis and carbonization. The activation energies calculated by both FWO and KAS method were similar. At high conversion stage (greater than 20%), the activation energies of the hydrochars were much higher than that of corn stalk. When the conversion rate was 75%, the activation energies of the hydrochar calculated by FWO and KAS method were 260.87 and 261.84 kJ/mol, respectively, while the activation energies of corn stalk were only 145.55 and 142.74 kJ/mol, respectively.

Key words: corn stalk, hydrochar, thermogravimetric, kinetic, activation energy

中图分类号:

TQ35

董向元, 郭淑青, 杨继涛, 高新杰, 王折折, 王树中. 玉米秸秆水热焦热解及动力学特性研究[J]. 林产化学与工业, 2018, 38(3): 83-89.

DONG Xiangyuan, GUO Shuqing, YANG Jitao, GAO Xinjie, WANG Zhezhe, WANG Shuzhong. Pyrolysis and Kinetic Characteristics of Corn Stalk Char from Hydrothermal Carbonization[J]. Chemistry and Industry of Forest Products, 2018, 38(3): 83-89.

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玉米秸秆水热焦热解及动力学特性研究

Pyrolysis and Kinetic Characteristics of Corn Stalk Char from Hydrothermal Carbonization

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