摘要
基于TG-FTIR联用技术研究Fe_2O_3对烟煤与半焦混合燃烧特性的影响,通过Starink法分析Fe_2O_3对样品不同反应阶段活化能的影响,结果表明:Fe_2O_3明显降低前期反应的活化能,使混合燃料的挥发分提前析出着火,降低着火温度T_i和前期最大失重峰温度T_1约18和50℃,提高混合燃料前期的可燃性;同时Fe_2O_3作为氧载体对混合燃料中后期固定碳的燃烧也具有催化作用,使得拐点温度T_o和后期最大失重峰温度T_2前移,并使中期反应活化能E_α趋于平稳,缓解了"抢风"现象,使中期燃烧过程变得平稳,在反应末期Fe_2O_3依然具有积极的催化作用,整个反应的平均活化能从82.8 kJ·mol^(-1)降低为72.1 kJ.mol^(-1),总体上提高了混合燃料综合燃烧性能;两种样品燃烧产生的气体主要是CO_2,其排放峰形基本与各自的DTG曲线对应.
Study on the effect of Fe2O3 on combustion characteristics of coal-char co-combustion based on TG-FTIR,and the effect of Fe2O3 on activation energy of samples in different stages of reaction was analyzed by Starink method. The results show that,Fe2O3 could significantly reduce the activation energy of early phase reaction, and contribute to the release and combustion of volatile matter, and reduce the ignition temperature Ti and the peak temperature of early weight loss T1 by18 and 50℃, and improve the ignitability of the mixing fuel. Fe2O3 also has catalytic effect on the combustion of fixed carbon as oxygen carrier, make the activation energy Ea and the combustion process of the medium-term reaction stable. In later stage reaction, Fe2O3 still has a positive catalytic effect on the coal-char co-combustion. With Fe2O3 addition, the average activation energy of whole reaction processes was decreased from 82.8 to 72.1 kJ-mol^-1, and the comprehensive combustion performance of coal-char blended was improved. the main gaseous products of two kinds of samples combustion is CO2, and the temperatures of CO2 intensity peaks of two kinds of samples are similar to those maximum mass loss rate peaks.
作者
户英杰
王志强
程星星
马春元
HU Ying-Jie;WANG Zhi-Qiang;CHENG Xing-Xing;MA Chun-Yuan(School Of Energy And Power Engineerings Shandong University,Jinan 250061,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2019年第4期938-944,共7页
Journal of Engineering Thermophysics
基金
国家重点研发计划(No.2017YFB0602002)
关键词
煤焦混合燃烧
催化
燃烧特性
反应动力学
coal-char co-combustion
catalysis
combustion characteristics
kinetics
作者简介
户英杰(1994),男,硕士研究生,主要从事煤与半焦的混合燃烧研究;通信作者:王志强,副教授,E-mail:jackywzq@sdu.edu.cn.
