Ignition Thresholds and Flame Propagation of Methane/Air Mixtures Ignited via Radiatively Heated Inert Particles

被引:2
作者
Ma, Junrong [1 ]
Zhang, Changsuo [1 ]
机构
[1] Taiyuan Univ Technol, Coll Min Engn, Taiyuan 030024, Peoples R China
关键词
combustion; ignition thresholds; methane; particles; thermal radiation; INFLAMMABLE GASES; LASER IGNITION; HYDROGEN-AIR; TEMPERATURE;
D O I
10.3390/en14165173
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The prevention and evaluation of explosions requires suitable standards of measurement. As such, for this study two ignition thresholds, the ignition temperature and the minimum ignition irradiance were selected as the assessment criteria. These ignition threshold values were experimentally determined by heating stationary inert silicon carbide particles via thermal radiation with a large spot size in order to ignite quiescent methane-air fuel mixtures. A high-speed Schlieren camera was used to capture the progression of the formation and propagation of the flames throughout the experiments. The results of the experiments show that the irradiance and temperature threshold are directly and inversely proportional to the particle size, respectively. Furthermore, the irradiance and temperature thresholds have similar tendencies within the flammability limits; wherein, the minimum value corresponds to fuel mixtures at a stoichiometric ratio, and increases as the equivalence ratio shifts toward the flammability limits. Irradiance thresholds, though, are more sensitive to changes in equivalence ratio than temperature. The temperature histories of the heated particle determined that when the irradiance is lower than its ignition threshold value, the heated particle-fuel mixture system will arrive at a thermal equilibrium, rather than ignition, due to the inability of the particle to reach the ignition temperature. This study also found that longer ignition times will result in a more drastic deformation of the flame fronts caused by natural convection.
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页数:10
相关论文
共 27 条
[1]  
Beyer M, 2012, SCI TECHNOL ENERG MA, V73, P1
[2]   Time-resolved temperature measurements for inert and reactive particles in explosive atmospheres [J].
Beyrau, F. ;
Hadjipanayis, M. A. ;
Lindstedt, R. P. .
PROCEEDINGS OF THE COMBUSTION INSTITUTE, 2015, 35 :2067-2074
[3]   Ignition of fuel/air mixtures by radiatively heated particles [J].
Beyrau, F. ;
Hadjipanayis, M. A. ;
Lindstedt, R. P. .
PROCEEDINGS OF THE COMBUSTION INSTITUTE, 2013, 34 :2065-2072
[4]   Experimental and numerical study on moving hot particle ignition [J].
Coronel, Stephanie A. ;
Melguizo-Gavilanes, Josue ;
Mevel, Remy ;
Shepherd, Joseph E. .
COMBUSTION AND FLAME, 2018, 192 :495-506
[5]   Continuous wave laser ignition thresholds of coal dust clouds [J].
Dubaniewicz, TH ;
Cashdollar, KL ;
Green, GM .
JOURNAL OF LASER APPLICATIONS, 2003, 15 (03) :184-191
[6]   Threshold powers and delays for igniting propane and butane-air mixtures by cw laser-heated small particles [J].
Dubaniewicz, Thomas H., Jr. .
JOURNAL OF LASER APPLICATIONS, 2006, 18 (04) :312-319
[7]   Numerical Simulation of the Ignition of Fuel/Air Gas Mixtures Around Small Hot Particles [J].
Haeber, Thomas ;
Zirwes, Thorsten ;
Roth, David ;
Zhang, Feichi ;
Bockhorn, Henning ;
Maas, Ulrich .
ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS, 2017, 231 (10) :1625-1654
[8]   LASER INITIATED COMBUSTION OF CH4+O2 MIXTURES [J].
HILL, RA ;
LAGUNA, GA .
OPTICS COMMUNICATIONS, 1980, 32 (03) :435-439
[9]   LASER IGNITION OF COMBUSTIBLE GASES BY RADIATIVE HEATING OF SMALL PARTICLES [J].
HILLS, PC ;
ZHANG, DK ;
SAMSON, PJ ;
WALL, TF .
COMBUSTION AND FLAME, 1992, 91 (3-4) :399-412
[10]   Thermal radiation from vented dust explosions [J].
Holbrow, P ;
Hawksworth, SJ ;
Tyldesley, A .
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES, 2000, 13 (06) :467-476