WANG Xiaoling，WANG Shaoqing，CHEN Hao，et al. The combustion characteristics and kinetic analysis of low-rank coals with different vitrinite/inertinite ratio[J]. Coal Science and Technology，2023，51（9）：302−309
. DOI: 10.12438/cst.2021-1477| Citation: |
WANG Xiaoling，WANG Shaoqing，CHEN Hao，et al. The combustion characteristics and kinetic analysis of low-rank coals with different vitrinite/inertinite ratio[J]. Coal Science and Technology，2023，51（9）：302−309 . DOI: 10.12438/cst.2021-1477
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To explain the effect of maceral composition on the combustion characteristics of coal, a series of low-rank coals with different vitrinite/inertinite ratio were collected as the research object, and the combustion characteristics, heat change process and gas escape behavior of the samples under air atmosphere were investigated using thermoanalytical methods (TG-MS-DTA). The results show that the maceral content has little effect on the temperature of the maximum reaction rate. However, it has an effect on the value of the maximum reaction rate, and the maximum reaction rate of the inertinite-rich coal is larger. Meanwhile, higher minerals in coal allow the reaction to reach its maximum rate at a higher temperature. The combustion process shows two obvious stages. The first stage (before 400 ℃) is exothermic slowly, corresponding to the devolatilization process, and the second stage (after 400 ℃) is exothermic rapidly, corresponding to the fixed-carbon combustion process. The exothermic characteristics of coal combustion show a slow to fast exothermic transition. Coal with different vitrinite/inertinite ratio mainly release CO2, CO, H2O during the combustion process, however, the relative content of the released gas is different. In the devolatilization stage, there is less CO2 and CO released, while more H2O release. In the fixed-carbon combustion stage, a large amount of CO2 is released, the amount of CO released is slightly lower, and H2O is the lowest. Among them, the inertinite-rich coal releases relatively more CO2 during the combustion process and burns more completely under the same conditions. In addition, the kinetic calculation of the coal combustion process is carried out with the Coats-Redfern method, and the trend of reaction activation energy increases as the vitrinite/inertinite ratio decreases. However, it does not affect the inertinite-rich coal in the fixed-carbon combustion stage. The ability to burn rapidly may be due to the cell lumen structure formed by a large number of fusinites, which enlarges the contact area between the surface of coal particles and O2, and the combustion reaction is sufficient.
| [1] |
李富兵,樊大磊,王宗礼,等. “双碳”目标下“拉闸限电”引发的中国能源供给的思考[J]. 中国矿业,2021,30(10):1−6.
LI Fubing,FAN Dalei,WANG Zongli,et al. Thoughts on China's energy supply caused by “power rationing” under the goal of “carbon peak and neutrality”[J]. China Mining Magazine,2021,30(10):1−6.
|
| [2] |
雷 鸣,黄星智,王春波. O2/CO2气氛下CO2和H2O气化反应对煤及煤焦燃烧特性的影响[J]. 燃料化学学报,2015,43(12):1420−1426.
LEI Ming,HUANG Xingzhi,WANG Chunbo. Effect of CO2 and H2O gasification on the combustion characteristics of coal and char under O2/CO2 atmosphere[J]. Journal of Fuel Chemistry and Technology,2015,43(12):1420−1426.
|
| [3] |
胡海华,段伦博,陈晓平,等. 增压O2/CO2气氛下煤燃烧特性实验研究[J]. 燃料化学学报,2014,42(4):408−413.
HU Haihua,DUAN Lunbo,CHEN Xiaoping,et al. Experimental investigation on pressurized coal combustion characteristics under O2/CO2 atmosphere[J]. Journal of Fuel Chemistry and Technology,2014,42(4):408−413.
|
| [4] |
SU S,POHL J H,HOLCOMBE D. A proposed maceral index to predict combustion behavior of coal[J]. Fuel,2001,80(5):699−706.
|
| [5] |
QIU J R,LI F,ZHANG C G,et al. Mineral transformation during combustion of coal blends[J]. International Journal of Energy Research,1999,23(5):453−463.
|
| [6] |
王小令,李 霞,曾凡桂,等. 基于HRTEM的煤中不同聚集态结构表征[J]. 煤炭学报,2020,45(2):749−756.
WANG Xiaoling,LI Xia,ZENG Fangui,et al. Characterization of different aggregate structures in coal based on HRTEM[J]. Joural of China Coal Society,2020,45(2):749−756.
|
| [7] |
NIU S L,LU C M,HAN K H,et al. Thermogravimetric analysis of combustion characteristics and kinetic parameters of pulverized coals in oxy-fuel atmosphere[J]. Journal of Thermal Analysis & Calorimetry,2009,98(1):267−274.
|
| [8] |
OTERO M,GOMEZ X,GARCíA A I,et al. Non-isothermal thermogravimetric analysis of the combustion of two different carbonaceous materials[J]. Journal of Thermal Analysis & Calorimetry,2008,93(2):619−626.
|
| [9] |
鲜晓红,杜云贵,张光辉. TG-DTG/DTA研究混煤的燃烧特性[J]. 煤炭转化,2011,34(3):67−70.
XIAN Xiaohong,DU Yungui,ZHANG Guanghui. Combustion characteristics of coal blending by TG-DTG/DTA[J]. Coal Conversion,2011,34(3):67−70.
|
| [10] |
聂其红,孙绍增,李争起,等. 褐煤混煤燃烧特性的热重分析法研究[J]. 燃烧科学与技术,2001,7(1):72−76.
NIE Qihong,SUN Shaozeng,LI Zhengqi,et al. Thermogravimetric analysis on the combustion characteristics of brown coal blends[J]. Journal of Comnustion Science and Technology,2001,7(1):72−76.
|
| [11] |
刘 倩,钟文琪,苏 伟,等. 基于热重−质谱联用的煤粉富氧燃烧动力学及污染物生成特性[J]. 化工学报,2018,69(1):523−530.
LIU Qian,ZHONG Wenqi,SU Wei,et al. Oxy-coal combustion kinetics and formation characteristics of pollutants based on TG-MS analysis[J]. CIESC Journal,2018,69(1):523−530.
|
| [12] |
YONG C,MORI S,PAN W P. Studying the mechanisms of ignition of coal particles by TG-DTA[J]. Thermochimica Acta,1996,275(1):149−158.
|
| [13] |
何 翔,刘建忠,杨雨濛,等. 基于热重红外联用技术的不同煤种燃烧特性研究[J]. 热力发电,2016,45(11):29−35.
HE Xiang,LIU Jianzhong,YANG Yumeng,et al. Combustion characteristics of different coals based on TG-DSC-FTIR coupled technology[J]. Thermal Power Generation,2016,45(11):29−35.
|
| [14] |
LIU L,WANG Z,CHE K,et al. Research on the release of gases during the bituminous coal combustion under low oxygen atmosphere by TG-FTIR[J]. Journal of the Energy Institute,2018,91(3):323−330.
|
| [15] |
文 虎,黄 遥,张玉涛,等. 氧气体积分数与升温速率对弱黏煤燃烧特性的影响[J]. 煤炭学报,2017,42(9):2362−2368.
WEN Hu,HUANG Yao,ZHANG Yutao,et al. Effects of oxygen concentration and heating rate on the characteristics of bituminous coal combustion[J]. Journal of China Coal Society,2017,42(9):2362−2368.
|
| [16] |
赵云鹏,胡浩权,靳立军,等. 矿物质对不同还原程度煤显微组分半焦燃烧特性影响[J]. 化工学报,2019,70(8):2946−2953.
ZHAO Yunpeng,HU Haoquan,JIN Lijun,et al. Effect of minerals on semi-coke combustion characteristics of maceral with different reducibility[J]. CIESC Journal,2019,70(8):2946−2953.
|
| [17] |
VALENTIM B. Petrography of coal combustion char: A review[J]. Fuel,2020,277:118271.
|
| [18] |
CAI H Y,MEGARITIS A,MESSENBOCK R,et al. Pyrolysis of coal maceral concentrates under pf-combustion conditions (I): changes in volatile release and char combustibility as a function of rank[J]. Fuel,1998,77(12):1273−1282.
|
| [19] |
CHOUDHURY N,BISWAS S,SARKAR P,et al. Influence of rank and macerals on the burnout behaviour of pulverized Indian coal[J]. International Journal of Coal Geology,2008,74(2):145−153.
|
| [20] |
ROBERTS M J,EVERSON R C,NEOMAGUS H,et al. Influence of maceral composition on the structure, properties and behaviour of chars derived from South African coals[J]. Fuel,2015,142:9−20.
|
| [21] |
王小令,王绍清,陈 昊,等. 不同镜惰比低阶煤的结构特征及其热解行为[J]. 煤炭科学技术,2023,51(5):294−301.
WANG Xiaoling,WANG Shaoqing,CHEN Hao,et al. The structural characteristics and pyrolysis behavior of low-rank coal with different Vitrinite/Inertinite ratio[J]. Coal Science and Technology,2023,51(5):294−301.
|
| [22] |
LI Q,ZHAO C,CHEN X,et al. Comparison of pulverized coal combustion in air and in O2/CO2 mixtures by thermo-gravimetric analysis[J]. Journal of Analytical and Applied Pyrolysis,2009,85(1/2):521−528.
|
| [23] |
孔德文,张建良,林祥海,等. 天然矿物添加剂对高炉喷吹煤粉燃烧特性的影响[J]. 北京科技大学学报,2011,33(9):1160−1165.
KONG Dewen,ZHANG Jianliang,LIN Xianghai,et al. Effects of the natural minerals on pulverized coal combustion characteristics[J]. Journal of University of Science and Technology Beijing,2011,33(9):1160−1165.
|
| [24] |
CAI Y D,LIU D M,LIU Z H,et al. Evolution of pore structure, submaceral composition and produced gases of two Chinese coals during thermal treatment[J]. Fuel Processing Technology,2017,156:298−309.
|
| [25] |
YEN F S,LO H S,WEN H L,et al. θ- to α-phase transformation subsystem induced by α-Al2O3-seeding in boehmite-derived nano-sized alumina powders[J]. Journal of Crystal Growth,2003,249(1/2):283−293.
|
| [26] |
LU G Q,DO D D. A kinetic study of coal reject-derived char activation with CO2, H2O, and air[J]. Carbon,1992,30(1):21−29.
|
| [27] |
胡 英. 物理化学, 第6版[M]. 高等教育出版社, 2014.
|
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