基于O_2/CO_2气氛的煤粉燃烧性能研究
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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 O_2/CO_2 atmosphere with the same O_2 concentration.Under O_2/CO_2 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.
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 O_2/CO_2 atmosphere with the same O_2 concentration.Under O_2/CO_2 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.
引文
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[2] YIN Chungen,YAN Jinyue.Oxy-fuel combustion of pulverized fuels:combustion fundamentals and modeling[J].Applied Energy,2016,162:742-762.
[3]郑楚光,赵永椿,郭欣.中国富氧燃烧技术研发进展[J].中国电机工程学报,2014,34(23):3856-3864.ZHENG Chuguang,ZHAO Yongchun,GUO Xin.Research and development of oxy-fuel combustion in China[J].Proceedings of the CSEE,2014,34(23):3856-3864.
[4] ABRAHAM B M,ASBURY J G,LYNCH E P,et al.Coal-oxygen process provides CO2 for enhanced recovery[J].Oil and Gas Journal,1982,80(11):68-75.
[5] ENGIN B,ATAKL H.Air and oxy-fuel combustion kinetics of low rank lignites[J].Journal of the Energy Institute,2018,91(2):311-322.
[6] WU Fan,ARGYLE M D,DELLENBACK P A,et al.Progress in O2 separation for oxy-fuel combustion—apromising way for cost-effective CO2capture:a review[J].Progress in Energy and Combustion Science,2018,67:188-205.
[7]李帅帅,王学斌,刘梓晗,等.O2/CO2气氛下碳烟氧化的反应动力学研究[J].动力工程学报,2017,37(8):673-678.LI Shuaishuai,WANG Xuebin,LIU Zihan,et al.Study on reaction kinetics of soot oxidation in O2/CO2atmosphere[J].Journal of Chinese Society of Power Engineering,2017,37(8):673-678.
[8] CROISET E,THAMBIMUTHU K,PALMER A.Coal combustion in O2/CO2mixtures compared with air[J].The Canadian Journal of Chemical Engineering,2000,78(2):402-407.
[9]李庆钊,赵长遂.O2/CO2气氛煤粉燃烧特性试验研究[J].中国电机工程学报,2007,27(35):39-43.LI Qingzhao, ZHAO Changsui.Investigation on characteristics of pulverized coal combustion in O2/CO2 mixtures[J].Proceedings of the CSEE,2007,27(35):39-43.
[10] HUANG Xiaohong,LIU Zhaohui,LI Jing,et al.Ignition behavior of pulverized coals in lower oxygen content O2/CO2atmosphere[C]//2nd Oxyfuel Combustion Conference.Wuhan:Huazhong University of Science and Technology,2011.
[11] WANG Chang'an,ZHANG Xiaoming,LIU Yinhe,et al.Pyrolysis and combustion characteristics of coals in oxyfuel combustion[J].Applied Energy,2012,97:264-273.
[12] YI Baojun,ZHANG Liqi,HUANG Fang,et al.Investigating the combustion characteristic temperature of 28kinds of Chinese coal in oxy-fuel conditions[J].Energy Conversion and Management,2015,103:439-447.
[13]李庆钊,赵长遂,武卫芳,等.O2/CO2气氛下煤粉燃烧反应动力学的试验研究[J].动力工程,2008,28(3):447-452.LI Qingzhao,ZHAO Changsui,WU Weifang,et al.Kinetics of pulverized coal combustion under mixed O2/CO2atmospheres[J].Journal of Power Engineering,2008,28(3):447-452.