Based on the complex gas solid reaction of coke combustion in O2/CO2 atmosphere, the various char random pore model (Various Char-RPM) was proposed to simulate char particle combustion process. The influencing factors of competition effect in the char particle combustion process were analysed. The results showed that the competition effect of coke combustion was mainly in the dynamic diffusion control area. The gas concentration in the pores of the particles was obviously fluctuating, and the combustion was extremely unstable. Increasing of the concentration of O2 of the environment and decreasing of the particle size of the coke can weaken or eliminate the competition effect, the latter more obvious.
Jian QU Baowei LI Zhijun GONG Wenfei WU
. Numerical Simulation of the Competition Effect of Single Particle Coke Combustion in O2/CO2 Atmosphere[J]. The Chinese Journal of Process Engineering, 2017
, 17(4)
: 725
-731
.
DOI: 10.12034/j.issn.1009-606X.216340
[1] KI Ohno, K Noda, K Nishioka, T Maeda, M Shimizu. Effect of coke combustion rate equation on numerical simulation of temperature distribution in iron ore sintering process[J]. Isij International, 2013, 53(9):1642-1647.
[2] J Saastamoinen, A Tourunen. Model for Char Combustion, Particle Size Distribution, and Inventory in Air and Oxy-fuel Combustion in Fluidized Beds[J]. Energy and Fuels, 2011, 26(1):407-416.
[3] 熊玮, 毕学工, 周国凡. 高炉焦炭层区渣、铁滞留特性的冷态模拟[J]. 过程工程学报, 2006, 6(3):347-351.
[4] 郭瑞, 汪琦, 赵雪飞,等. 焦炭反应性及反应后热性质及其检测方法[J]. 过程工程学报, 2013, 13(3).
[5] 赵晴晴, 薛庆国, 佘雪峰,等. H_2O和CO_2对焦炭溶损反应动力学的研究[J]. 过程工程学报, 2012(5).
[6] A Gómez. An approximate method for solving gas–solid non-catalytic reactions[J]. Chemical Engineering Science, 2006, 61(11):3725–3735.
[7] SK Bhatia, DD Perlmutter. A random pore model for fluid-solid reactions: I. Isothermal, kinetic control[J]. AIChE. J, 1981, 26(3): 379-385.
[8] SK Bhatia, DD Perlmutter. A random pore model for fluid-solid reactions: II. Diffusion and transport effects[J]. AIChE. J, 1981, 27(2): 247-254.
[9] RPWJ Struis, CV Scala, S Stucki, et al. Gasification reactivity of charcoal with CO2. Part I: Conversion and structural phenomena[J]. Chemical Engineering Science, 2002,57(17):3581-3592.
[10] 杨帆, 范晓雷, 周志杰,等. 随机孔模型应用于煤焦与CO_2气化的动力学研究[J]. 燃料化学学报, 2005, 33(6):671-676.
[11] 陈明磊,李保卫,武文斐.焦炭颗粒在不同控制区域中的燃烧特性[J] .过程工程学报,2014,14(2):291-295.
[12] 代涛,龚志军,李保卫,等.褐铁矿颗粒低温CO磁化还原焙烧的实验研究与数值模拟[J] .过程工程学报,2014,14(4):624-630.
[13] RH Hurt, JM Calo. Semi-globai intrinsic kinetics for char combustion modeling[J]. Combustion and Flame. 2001, 125(3): 1138-1149.
[14] S Niksa, GS Liu, RH Hurt. Coal conversion submodels for design applications at elevated pressures. Part I. Devolatilization and char oxidation[J]. Progress in Energy and Combustion Science. 2003, 29(5):425-477
[15] O Senneca, L Cortese. Kinetics of coal oxy-combustion by means of different experimental techniques[J]. Fuel. 2012, 102(6): 751-759.
[16] ES Hecht, CR Shaddix, M Geier, A Molina, et al. Effect of CO2 and steam gasification reactions on the oxy-combustion of pulverized coal char[J]. Combustion and Flame, 2012, 159(11):3437-3447.
[17] T. Maffei, Kinetic of Coal Combustion[D]. Politecnico di Milano, Milano, 2013.
[18] T Maffei, R Khatami, S Pierucci, et al. Experimental and modeling study of single coal particle combustion in O2/N2 and Oxy-fuel(O2/CO2) atmospheres[J]. Combustion and Flame, 2013, 160(11):2559-2572.