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O2/CO2气氛下煤粉燃烧特性及动力学分析 预览

Coal Combustion Characteristics and Kinetics Analysis in O2/CO2 Atmosphere
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摘要 采用热重实验系统进行了煤粉在 O2/N2 和 O2/CO2 气氛下的燃烧实验,研究了氧体积分数和粒径对燃烧特性的影响.实验结果表明,氧体积分数越高、粒径越小,煤粉的燃烧特性越好.在氧体积分数较高时,煤粉在O2/CO2气氛下的反应比在 O2/N2 气氛下进行得慢;而氧体积分数较低时,煤粉在 O2/CO2气氛下的反应比在 O2/N2气氛下进行得快.此外,采用 Coats-Redfern 积分法、Flynn-Wall-Ozawa 积分法和 Kissinger-Akahira-Sunose 积分法对煤粉在程序升温过程中的燃烧反应做了相应的动力学分析.结果表明,O2/N2 和 O2/CO2 气氛下不同氧体积分数时的煤粉燃烧反应动力学参数表观活化能 E 和指前因子 A 之间具有动力学补偿效应.煤粉燃烧过程中在同一转化率下的表观活化能 E随其粒径的减小而降低. A series of pulverized coal combustion experiments in O2/N2 and O2/CO2 atmosphere were performed in a thermogravimetric analyzer(TGA)to study the effects of oxygen concentration and particle size on combustion characteristic. The results indicate that the combustion characteristics of pulverized coal are improved with the increase in oxygen concentration and the decrease in particle size. Under high oxygen concentration,the reaction in O2/CO2 atmosphere is slower than that in O2/N2 atmosphere. But the reaction in O2/CO2 atmosphere is faster than that in O2/N2 atmosphere under low oxygen concentration. In addition,the kinetics analysis of coal combustion in the heating process was carried out by Coats-Redfern method,FWO method and KAS method. The results show that there exists a kinetic compensation effect between the activation energy E and the pre-exponential factor A in the pulverized coal combustion under different oxygen concentrations in the atmospheres of O2/N2 and O2/CO2. The reactivity of pulverized coal combustion is low at the early and later stage. The apparent activation energy of coal combustion decreases with the decrease of particle size under the same conversion rate.
作者 李德波 张远航 赵菁 王长安 冯永新 车得福 Li Debo1,Zhang Yuanhang2,Zhao Jing2,Wang Chang′an2,Feng Yongxin1,Che Defu2(1. Electric Power Research Institute of Guangdong Power Grid Corporation,Guangzhou 510080,China; 2. State Key Laboratory of Multiphase Flow in Power Engineering,Xi′an Jiaotong University,Xi′an 710049,China)
出处 《燃烧科学与技术》 CSCD 北大核心 2018年第3期223-231,共9页 Journal of Combustion Science and Technology
基金 南方电网公司科技资助项目(GDKJQQ20152013).
关键词 热重分析 O2/CO2燃烧 氧体积分数 粒径 燃烧特性 动力学分析 thermogravimetric analysis O2/CO2 combustion oxygen concentration particle size combustion characteristics kinetics analysis
作者简介 李德波(1983-),男,博士,教授级高级工程师,ldbyx@126.com.;通讯作者:车得福,男,博士,教授,dfche@mail.xjtu.edu.cn.
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