摘要
采用热重分析法研究富氧燃烧(O_2/CO_2)气氛、O_2体积分数和煤粉活性对褐煤、烟煤、无烟煤3种煤粉燃烧性能的影响,并进行分温度区间的燃烧反应动力学分析。结果表明:褐煤和无烟煤发生非均相着火,烟煤发生均相-非均相着火;相比空气气氛,O_2体积分数相同的O_2/CO_2气氛下煤粉的着火温度和燃尽温度升高,燃尽时间延长;在O_2/CO_2气氛下,当O_2体积分数增大时,煤粉着火温度和燃尽温度降低,燃尽时间缩短;相同气氛下,煤粉活性显著影响其着火和燃尽;根据综合燃烧特性指数判断,增大O_2体积分数显著改善了煤粉的燃尽特性;在低温区,煤粉燃烧属于0.3级反应,在高温区则为1～2.5级反应。
In the process of oxy-fuel combustion,the effects of atmosphere,oxygen concentration and coal type on the coal combustion characteristics were investigated using thermogravimetric analysis,while the combustion kinetics was studied for different temperature zones.Results show that the ignition of lignite and anthracite is of the heterogeneous kind,and that of the bituminous coal presents hetero-homogeneous features.Compared with air,the ignition temperature increases and the burnout time extends for pulverized coal in O2/CO2 atmosphere with the same O2 concentration.Under O2/CO2 atmosphere,both the ignition temperature and burnout temperature decrease while the burnout time shortens as the oxygen concentration rises.The coal type has significant effect on the ignition and burnout of coal under same atmosphere.In terms of combustion characteristic index S,increasing the oxygen concentration would improve the burnout rate of pulverized coal.In the low-temperature zone,the reaction order of pulverized coal is0.3,while in the high-temperature zone,the reaction order lies in 1-2.5.
作者
应芝
郑晓园
崔国民
YING Zhi;ZHENG Xiaoyuan;CUI Guamin(School of Energy and Power Engineering,University of Shanghai for Science andTechnology,Shanghai 200093 ,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2019年第1期7-12,32,共7页
Journal of Chinese Society of Power Engineering
基金
国家自然科学基金资助项目(51606128
51706144)
上海市自然科学基金资助项目(16ZR1422900
17ZR1419500)
上海高校青年教师培养资助计划项目(ZZslg16001)
关键词
O2/CO2
煤粉
燃烧性能
着火模式
反应动力学
02/C02
pulverized coal
combustion characteristics
ignition mechanism
kinetics
