Experimental Study of Flame Characteristics in Simple Cubic Packed Beds

doi:10.16183/j.cnki.jsjtu.2021.317

Abstract

Abstract:

The combustion of porous media is characterized by high efficiency and good stability. A simple cubic packed structure consisting of an alumina particle packed bed and double-layer silicon carbide foam ceramics was proposed to study the filtration combustion characteristics of the structure. By changing the premixed gas equivalent ratio and inlet velocity, the flammability limit of flame, flame propagation law, CO emission law, and combustion efficiency under different working conditions were studied. It is found that the stabilization and propagation of the flame depend on the regional temperature, the equivalent ratio, and the velocity. In the bed with a particle diameter of 40 mm, the flame is easy to spread and the combustion efficiency is high, while in the bed with a particle diameter of 20 mm, the flame is more stable.

Key words: simple cubic packing, flammability limit, flame propagation, carbon monoxide volume fraction

CLC Number:

TQ038.4
TK16

YIN Zhicheng, WANG Ping, JIANG Linsong, SUN Ying, HE Zuqiang. Experimental Study of Flame Characteristics in Simple Cubic Packed Beds[J]. Journal of Shanghai Jiao Tong University, 2023, 57(3): 326-334.

Figures/Tables 16

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多孔介质	孔隙率/%	导热系数/ (W·m^-1·K^-1)	辐射率
SiC泡沫陶瓷1	82.5	16.7	0.9
SiC泡沫陶瓷2	64.5	16.7	0.9
40 mm Al₂O₃堆积床	52.4	29.3	0.8
20 mm Al₂O₃堆积床	52.4	29.3	0.8

进气管入口速度/ (m·s^-1)	流量/(L·min^-1)	燃烧室入口速度/(m·s^-1)
10	27.2	0.28
15	40.8	0.42
20	54.4	0.57
25	68.0	0.71
30	81.7	0.85