摘要
基于热重实验和多伪组分平行反应模型,采用多峰高斯拟合与Coats-Redfern分析相结合的方法,比较研究牛粪及其热解半焦的热解动力学特性,重点分析制焦温度（300-600℃）和升温模式（慢速和快速）的影响。结果表明：随着热解温度的升高,牛粪热解反应表现为脂溶性物质、半纤维素、纤维素、木质素以及灰分5大伪组分先后发生异化、分解,脱挥发分的过程,相互耦合,但具有各自的热分解主导区间;5大伪组分的活化能依次为33.34、98.27、176.51、31.34和63.27 kJ/mol,热分解主导区间分别为120-400℃、250-380℃、310-370℃、250-530℃和600-700℃;随着制焦温度的升高,残余半焦中木质素伪组分的活化能逐渐增大,且随制焦温度的升高而升高,灰分伪组分的活化能也较牛粪原样中灰分伪组分的活化能有不同程度的增加,但并非线性递增关系;慢速和快速制焦模式对半焦中伪组分的活化能影响显著,但对其热分解主导区间的影响较小。
Based on thermogravimetric（TG） experiments and multi-pseudo-component parallel reaction model,combining multimodal Gaussian fitting with Coats-Redfern analysis,the pyrolysis kinetic characteristics of cattle manureand its pyrolyzed semi-char are compared and studied. The effect of making char temperature（300-600 ℃）andtemperature increase mode（slow and fast） is specially analyzed. The results show that with the rise of pyrolysistemperature, the pyrolysis reaction of cattle manures expresses as the processes of fat-soluble substances,hemicellulose, cellulose, lignin and ash five major pseudo components which have undergone dissimilation,decomposition and devolatilization,coupling each other,but with their own thermal decomposition dominant range. Theactivation energies of five large pseudo-components are 33.34,98.27,176.51,31.34 and 63.27 kJ/mol,respectively;the corresponding pyrolysis dominating ranges are 120-400 ℃,250-380 ℃,310-370 ℃,250-530 ℃ and 600-700 ℃,respectively. With the increase of the making-char temperature,the activation energy of the lignin pseudo component inremaining semi-char gradually increases. Similarly,the activation energy of ash pseudo component also has differentdegree of increase than the activation energy of the ash pseudo-component in the original cattle manure,but it is not alinear increasing relationship. The effect of slow and rapid making char modes on the activation energy of pseudocomponents in sem-char is significant,but the effect on the thermal decomposition dominating ranges is smaller.
作者
刘玉龙
辛娅
刘虎
何涛
曹红亮
袁巧霞
Liu Yulong;Xin Ya;Liu Hu;He Tao;Cao Hongliang;Yuan Qiaoxia(College of Engineering, Huazhong Agricultural University, Wuhan 430070, China;The Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China;IVuhan Optics Valley Bluefire New Energy Incorporated Company, Wuhan 430072, China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2018年第6期1688-1695,共8页
Acta Energiae Solaris Sinica
基金
公益性行业(农业)科研专项经费(201303091)
中央高校基本科研业务费专项资金(2662015QC002
2015PY077)
关键词
生物质
生物炭
活化能
牛粪
伪组分
biomass
biochar
activation energy
cattle manure
pseudo-component
