不同可燃液体层高度下浸润多孔介质砂床组合燃烧特性实验研究

doi:10.11949/0438-1157.20211489

摘要/Abstract

摘要：

为探究不同可燃液体层高度下浸润多孔介质砂床组合燃烧特性，开展了一系列不同粒径和液体层高度的燃烧测试，测量了燃料（乙醇）质量损失速率、火焰高度、多孔介质砂床（石英砂）温度和羽流温度等特征参数，分析研究了液体层高度的影响机制。结果表明：可燃液体层的存在对浸润石英砂层燃烧特性具有一定的影响。当砂层上方存在液体层时（h=20~60 mm），浸润石英砂层燃料质量损失速率明显增大，这可归因于液体层燃烧的预热作用。火焰高度随液体层高度增加而先增加随后几乎不变，表现为与质量损失速率相似趋势。浸润石英砂层内部在78.7~79.0℃（接近燃料沸点）出现温度增长迟滞，据此可对砂层内部蒸气区移动速率进行评估。随着液体层高度增加及石英砂粒径减小，砂层内蒸气区移动速率逐渐增大。此外，基于前人推荐的羽流关系和当前实验数据，获得了描述可燃液体浸润多孔介质砂床燃烧火焰羽流轴向温度经验公式。

关键词: 多孔介质, 液体层高度, 燃烧, 相变, 传热, 火焰特征

Abstract:

In order to investigate the combined burning characteristics of soaked porous media sand bed under different combustible liquid layer heights, a series of burning tests with different sand sizes and liquid layer heights were conducted. The characteristic parameters, fuel (ethanol) mass loss rate, flame height, internal temperature of porous media (quartz sand) and plume temperature were measured, and the effect mechanism of liquid layer height was analyzed and studied. The results show that the existence of combustible liquid layer has a certain effect on burning characteristics of quartz sand infiltration layer. When there is a liquid layer above the sand layer (h=20—60 mm), the mass loss rate of quartz sand infiltration layer increases obviously, which can be attributed to the preheating effect of liquid layer burning. The flame height increases firstly and then stabilizes with the increase of liquid layer height, which shows the similar trend with mass loss rate. The temperature growth retardation occurs inside sand bed within 78.7—79.0℃ (which is close to fuel boiling point), so the vapor zone movement speed inside sand bed can be evaluated. As the height of the liquid layer increases and the particle size of the quartz sand decreases, the velocity of the vapor zone in the sand layer gradually increases. In addition, based on previous scholar's plume relationship and current experimental data, an empirical formula is obtained to describe axial temperature of flame and plume for combustible liquid-soaked inert porous media sand bed.

Key words: porous media, liquid layer height, combustion, phase change, heat transfer, flame appearance

中图分类号:

X 932

张宇伦, 陈长坤, 雷鹏. 不同可燃液体层高度下浸润多孔介质砂床组合燃烧特性实验研究[J]. 化工学报, 2022, 73(4): 1826-1833.

Yulun ZHANG, Changkun CHEN, Peng LEI. Experimental study on combined burning characteristics of soaked porous media sand bed under different combustible liquid layer heights[J]. CIESC Journal, 2022, 73(4): 1826-1833.

图/表 9

图1 实验装置示意图

Fig.1 Experimental configuration

图2 温度测点布置图

Fig.2 Layout of thermocouple points

图3 不同液体层高度工况下燃料质量损失速率

Fig.3 Fuel mass loss rate at different liquid layer thickness

图4 不同液体层高度工况稳定阶段质量损失速率

Fig. 4 Mass loss rate at stable combustion stage at different liquid layer thickness cases

图5 典型工况火焰特征（d=1.800 mm, h=0 mm）

Fig.5 Flame characteristics in the typical case (d=1.800 mm, h=0 mm)

图6 不同液体燃料层高度工况火焰高度

Fig.6 Flame height under different liquid fuel layer height

图7 火焰羽流轴向温度分布

Fig.7 Axial temperature distribution of flame plumes

图8 不同液体层高度下石英砂层内部温度（d=0.191 mm系列工况）

Fig.8 Internal temperature of quartz sand layer under different liquid layer height（d=0.191 mm series cases）

图9 浸润石英砂层中可燃液体燃烧阶段蒸气区平均移动速度

Fig.9 Average movement speed of vapor zone in combustible liquid burning stage of quartz sand layer

参考文献 30

1	Zanganeh J, Moghtaderi B, Ishida H. Combustion and flame spread on fuel-soaked porous solids[J]. Progress in Energy and Combustion Science, 2013, 39(4): 320-339.
2	姚瑶, 郭进, 谢烽, 等. 倾斜角对液体燃料润湿条件下砂床表面火蔓延的影响[J]. 化工学报, 2013, 64(11): 4025-4030.
	Yao Y, Guo J, Xie F, et al. Effect of inclination angle on flame spread over sand bed wetted with liquid fuel[J]. CIESC Journal, 2013, 64(11): 4025-4030.
3	Hu L H, Tang F, Wang Q, et al. Burning characteristics of conduction-controlled rectangular hydrocarbon pool fires in a reduced pressure atmosphere at high altitude in Tibet[J]. Fuel, 2013, 111: 298-304.
4	Hu L H. A review of physics and correlations of pool fire behaviour in wind and future challenges[J]. Fire Safety Journal, 2017, 91: 41-55.
5	Akita K. Some problems of flame spread along a liquid surface[J]. Symposium (International) on Combustion, 1973, 14(1): 1075-1083.
6	赵金龙, 袁杰, 田逢时, 等. 初始油温对变压器油燃烧特性的影响[J]. 化工学报, 2020, 71(7): 3379-3386.
	Zhao J L, Yuan J, Tian F S, et al. Effect of initial fuel temperature on burning characteristics of transformer oil[J]. CIESC Journal, 2020, 71(7): 3379-3386.
7	Lin Y J, Hu L H, Zhang X L, et al. Experimental study of pool fire behaviors with nearby inclined surface under cross flow[J]. Process Safety and Environmental Protection, 2021, 148: 93-103.
8	Ding L, Gong C Z, Ge F L, et al. Experimental study on flame radiation characteristic from line pool fires of n-heptane fuel in open space[J]. Energy, 2021, 218: 119435.
9	Liu C X, Ding L, Jangi M, et al. Experimental study of the effect of ullage height on flame characteristics of pool fires[J]. Combustion and Flame, 2020, 216: 245-255.
10	Tang F, Hu L H, Wang Q, et al. Flame pulsation frequency of conduction-controlled rectangular hydrocarbon pool fires of different aspect ratios in a sub-atmospheric pressure[J]. International Journal of Heat and Mass Transfer, 2014, 76: 447-451.
11	Vaz G C, André J C S, Viegas D X. Fire spread model for a linear front in a horizontal solid porous fuel bed in still air[J]. Combustion Science and Technology, 2004, 176(2): 135-182.
12	Kong W J, Chao C Y H, Wang J H. Behavior of non-spread diffusion flames of combustible liquid soaked in porous beds[J]. Proceedings of the Combustion Institute, 2002, 29(1): 251-257.
13	Chao C Y H, Wang J H, Kong W J. Effects of fuel properties on the combustion behavior of different types of porous beds soaked with combustible liquid[J]. International Journal of Heat and Mass Transfer, 2004, 47(24): 5201-5210.
14	Chen C K, Lei P, Zhang Y L, et al. Experimental study of influence of fuel ratio on combustion characteristics of diesel-wetted wood powder[J]. Journal of Thermal Science, 2020, 29(4): 884-892.
15	陈晓婷, 孔文俊, 王宝瑞. 外界辐射对浸没在多孔介质中的液体燃料燃烧特性的影响[J]. 工程热物理学报, 2007, 28(5): 871-874.
	Chen X T, Kong W J, Wang B R. Effect of external heat flux on combustion behaviors of porous beds soaked with liquid fuels[J]. Journal of Engineering Thermophysics, 2007, 28(5): 871-874.
16	Hirano T, Suzuki T, Sato J, et al. Flame spread over crude oil sludge[J]. Symposium (International) on Combustion, 1985, 20(1): 1611-1617.
17	Zanganeh J, Moghtaderi B. Experimental study of temperature distribution and flame spread over an inert porous bed wetted with liquid fuel[J]. International Journal of Emerging Multidisciplinary Fluid Sciences, 2010, 2(1): 1-14.
18	Zanganeh J, Moghtaderi B. Investigation of flame propagation over an inclined fuel wetted porous bed[J]. Fire Safety Journal, 2014, 67: 113-120.
19	Ishida H. Initiation of fire growth on fuel-soaked ground[J]. Fire Safety Journal, 1992, 18(3): 213-230.
20	Ishida H. Flame tip traveling in boundary layer flow with flammable mixture along fuel-soaked ground[J]. Journal of Fire Sciences, 2012, 30(1): 17-27.
21	Ishida H, Kenmotsu Y. Flame spread in opposed flow along the ground soaked with high-volatile liquid fuel[J]. Journal of Fire Sciences, 2009, 27(3): 285-297.
22	Ishida H. Flame tip propagation with assisted flow along fuel-soaked ground[J]. Journal of Fire Sciences, 2011, 29(2): 99-110.
23	Zanganeh J, Moghtaderi B. Flame spread over porous sand beds wetted with propenol[J]. Fire and Materials, 2011, 35(2): 61-70.
24	Fu Y Y, Gao Z H, Ji J, et al. Experimental study of flame spread over diesel and diesel-wetted sand beds[J]. Fuel, 2017, 204: 54-62.
25	Suzuki T, Kawamata M, Matsumoto K, et al. Behavior of the reverse flow in front of the leading flame edge spreading over fuel-soaked sand in an air stream[J]. Fire Safety Science, 1991, 3: 227-236.
26	Suzuki T, Kawamata M, Hirano T. Flame spread over fuel soaked sand in an opposed air stream[J]. Fire Safety Science, 1989, 2: 199-208.
27	Karlsson B, Quintiere J. Enclosure Fire Dynamics[M]. Boca Raton: CRC Press, 1999.
28	Nield D A, Bejan A. Convection in Porous Media[M]. Berlin: Springer, 2006.
29	McCaffrey B J. Purely buoyant diffusion flames[R]. National Bureau of Standards, 1979.
30	Ji J, Fan C G, Zhong W, et al. Experimental investigation on influence of different transverse fire locations on maximum smoke temperature under the tunnel ceiling[J]. International Journal of Heat and Mass Transfer, 2012, 55(17/18): 4817-4826.

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