Non-isothermal combustion kinetics of two kinds of low volatile pulverized coals (HL coal and RU coal) were investigated by thermogravimetric analysis. The results show that the combustibility of HL coal was better than that of RU coal, and with increasing heating rate, ignition and burnout characteristics of pulverized coal were improved. The volume model (VM), the random pore model (RPM), and the new model (NEWM) in which the whole combustion process is considered to be the overlapping process of volatile combustion and coal char combustion, were used to fit with the experimental data. The comparison of these three fitted results indicated that the combustion process of coal could be simulated by the NEWM with highest precision. When calculated by the NEWM, the activation energies of volatile combustion and coal char combustion are 130.5 and 95.7 kJ·mol-1 for HL coal, respectively, while they are 114.5 and 147.6 kJ·mol-1 for RU coal, respectively.
Abstract
Non-isothermal combustion kinetics of two kinds of low volatile pulverized coals (HL coal and RU coal) were investigated by thermogravimetric analysis. The results show that the combustibility of HL coal was better than that of RU coal, and with increasing heating rate, ignition and burnout characteristics of pulverized coal were improved. The volume model (VM), the random pore model (RPM), and the new model (NEWM) in which the whole combustion process is considered to be the overlapping process of volatile combustion and coal char combustion, were used to fit with the experimental data. The comparison of these three fitted results indicated that the combustion process of coal could be simulated by the NEWM with highest precision. When calculated by the NEWM, the activation energies of volatile combustion and coal char combustion are 130.5 and 95.7 kJ·mol-1 for HL coal, respectively, while they are 114.5 and 147.6 kJ·mol-1 for RU coal, respectively.
关键词
pulverized coal /
combustion /
kinetics model
{{custom_keyword}} /
Key words
pulverized coal /
combustion /
kinetics model
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
［1］ E.M.Fisher, C.Dupont, L.I.Darvell, et al. Combustion and Gasification Characteristics of Chars Form Raw and Torrefied Biomass[J]. Bioresource Technology, 2012,119:157.
［2］ Richelieu Barranco, Andres Rojas, Juan Barraza, et al. A New Char Combustion Kinetic Model 1. Formulation[J]. Fuel,2009,88:2335.
［3］ Stanislaw Porada. The Reactions of Formation of Selected Gas Products During Coal Pyrolysis[J]. Fuel, 2004,83(9):1191.
［4］ Peter R. Solomon, Michael A. Serio, Girish V.Despande, et al. Cross-linking Reaction During Coal Conversion[J]. Energy Fuels, 1990,4:42.
［5］ Stanislaw Porada. The Influence of Elevated Pressure on the Kinetics of Evolution of Selected Gaseous Products During Coal Pyrolysis[J].Fuel,2004,83(7-8):1071.
［6］ Jerzy Tomeczek, Stanislaw Gil. Volatiles Release and Porosity Evolution during High Pressure Coal Pyrolysis[J].Fuel, 2003,82(3):285.
［7］ Zhang Jian-yu, Wang Bo, Yan Yongjie, et al. Behavior of Pyrolysis of Some Chinese Coals[J]. Journal of East China University of Science and Technology, 2000,26(6):642.
［8］ Thomas P. Griffin, Jack B. Howard, William A. Peters. An Experimental and Modeling Study of Heating Rate and Particle Size Effects in Bituminous Coal Pyrolysis[J]. Energy Fuels, 1993,7:297.
［9］ Thomas P. Griffin, Jack B. Howard, William A. Peters. Pressure and Temperature Effects in Bituminous Coal Pyrolysis: Experimental Observations and a Transient Lumped-parameter Model[J]. Fuel, 1994,73(4): 591.
［10］ Chaoqun Zhang, Xiumin Jiang, Lihong Wei, et al. Reasearch on Pyrolysis Characteristics and Kinetics of Super Fine and Conventional Pulverized Coal[J].Energy Conversion and Management, 2007,48:797.
［11］ Kasaoka S, Sakata Y, Kayano S, et al. Kinetic Evaluation of Reactivity of Various Coal Chars for Gasification with Carbon Dioxide in Comparison with Stream[J]. International Chemical Engineering, 1984, 25(1): 160.
［12］ Shang J Y, Eduardo E W. Kinetic and FTIR Studies of the Sodium Catalyzed Steam Gasification of Coal Char[J]. Fuel, 1984, 63(11):1640.
［13］ Bhatia S K, Perlmutter D D. A Random Pore Model for Fluid-solid Reactions: ? Isothermal Kinetic Control[J]. AIChE Journal, 1980, 26(3): 379.
［14］ Bhatia S K, Perlmutter D D. A Random Pore Model for Fluid-solid Reactions: ?? Diffusion and Transport Effects[J]. AIChE Journal, 1981, 27(2):247.
［15］ Rodriguez-Fernandez J, Oliva F, Vazquez R A. Charaterization of the Diesel Soot Oxidation Process through an Optimized Thermogravimetric Method[J]. Energy Fuels, 2011,25(5):2039.
［16］ Hom N S, Lakshitha P, Ameya J, Steven L S, Ashish B M. Experimental Study of Carbon Black and Diesel Engine Soot Oxidation Kinetics using Thermogravimetric Analysis[J]. Energy Fuels, 2012,26(9):5613.
［17］ Zouaoui N, Brilhac J, Mechati F, Jeguirim M, Djelloulli B, Gilot P. Study of Experimental and Theoretical Procedures when using Thermogravimetric Analysis to Determine Kinetic Parameters of Carbon Black Oxidation[J]. Journal of Thermal Analysis Calorimetry, 2010,102(3):837.
［18］ Khawam A, Flanagan D R. Solid-state Kinetic Models: Basics and Mathematical Fundamentals[J]. The Journal of Physical Chemistry B, 2006,110(35):472.
［19］ Xu Yuan-gang, Zhang Cheng, Xia Ji, et al. Experimental Study on the Comprehensive Behavior of Combustion for Blended Coals[J]. Asia-Pacific Journal of Chemical Engineering. 2010,5(3):435-440.
［20］ Essenhigh R H, MISRA M K, SHAW S W. Ignition of coal particles: A review [J]. Combustion and Flame, 1989,77:3.
［21］ Jiang Xiu-min, Li Ju-bin, Qiu Jian-rong. Study on Combustion Characteristics of Micaro-pulverized Coal[J]. Proceedings of CSEE. 2000, 20(6):71.
［22］ QI Cheng-lin, ZHANG Jian-liang,LIN Xiang-hai,et al. Investigation on Pulverized Coal Combustion Behavior by Non-Isothermic Integral Thermogravimetry Method[J]. Journal of iron and steel research international, 2011,18 (8): 1.
［23］ ZHANG Jian-liang, WANG Guang-wei, XING Xiang-dong, et al. Combustion Characteristics and Kinetics of Pulverized Coal in Oxygen-Enriched Environments[J]. Journal of iron and steel research, 2013,25(4): 9.
［24］ LONG Shi-gang, Cao Feng, WANG Si-wei,et al. Combustion Characteristics of Polyethylene and Coal Powder at High Temperature[J]. Journal of iron and steel research international,2008,15(1):6.
［25］ ZHANG Sheng-Fu, BAI Chen-guang, WEN Liang-ying et al. Gas-particle Flow and Combustion Characteristics of Pulverized Coal Injection in Blast Furnace Raceway[J]. Journal of iron and steel research international,2010,17(10):8.
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
基金
National Basic Research Program of China (973 Program);National Key Technology R&D Program in the 12th Five year Plan of China
{{custom_fund}}
PDF(458 KB)
