Formation and explosion characteristics of methanol spray droplets in confined space

ZANG Xiaowei; YU Hao; LYU Qishen; PAN Xuhai; JIANG Juncheng

doi:10.11883/bzycj-2019-0128

Volume 40 Issue 3

Mar. 2020

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ZANG Xiaowei, YU Hao, LYU Qishen, PAN Xuhai, JIANG Juncheng. Formation and explosion characteristics of methanol spray droplets in confined space[J]. Explosion And Shock Waves, 2020, 40(3): 032201. doi: 10.11883/bzycj-2019-0128

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ZANG Xiaowei, YU Hao, LYU Qishen, PAN Xuhai, JIANG Juncheng. Formation and explosion characteristics of methanol spray droplets in confined space[J]. Explosion And Shock Waves, 2020, 40(3): 032201. doi: 10.11883/bzycj-2019-0128

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Formation and explosion characteristics of methanol spray droplets in confined space

doi: 10.11883/bzycj-2019-0128

ZANG Xiaowei^{1, 2, 3
,},
YU Hao¹,
LYU Qishen¹,
PAN Xuhai^{1, 2, 3
,
,},
JIANG Juncheng^{1, 2, 3}

1.
College of Safety Science and Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China
2.
Institute of Fire Science and Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China
3.
Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, Nanjing Tech University, Nanjing 211816, Jiangsu, China

Received Date: 2019-04-16
Rev Recd Date: 2019-09-02

Available Online: 2020-07-25

Publish Date: 2020-03-01

Abstract

Abstract

In order to improve the standard testing method of droplet explosion, the droplet formation process and explosion characteristics of methanol were experimentally studied in the 20 L spherical spray testing system, under different ambient pressures, injection pressures and concentrations. The results show that the increasing of injection pressure is more likely to cause the methanol to break into tiny droplets, leading the explosion limit range of methanol droplets broadened. The increasing of ambient pressure would change the explosion limit range of methanol droplet, and can effectively inhibit the explosion accident caused by methanol leakage. When the ambient pressure is 0.1 MPa, and the injection pressure is 2.1 MPa, with the spray concentration of methanol is 356.4 g/m³, the droplet size of the methanol is 2.5 μm. The maximum explosive pressure, the maximum explosion pressure rising rate and the laminar burning rate are the highest at this inflection point. Small droplets (1−15 μm) are more easily ignited by external energy, and the transient physical and chemical reactions are more rapid and violent during explosion. Larger droplets (more than 22 μm) will cause ignition difficult. However, after the ignition is successful, the explosion characteristics increase with the increasing of methanol droplet concentration, showing an approximate linear rule. At this time, the influence of droplet size of methanol on the above explosion characteristics can be neglected. The results could be helpful to understand the law of droplet explosion, improve the testing method and safety design.
- methanol,
- injection pressure,
- ambient pressure,
- droplet size,
- explosion characteristics

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References(18)

References

[1]	吕启申, 臧小为, 潘旭海, 等. 温度和浓度对甲醇喷雾爆炸特性参数的影响 [J]. 爆炸与冲击, 2019, 39(9): 095402. DOI: 10.11883/bzycj-2018-0121. LYU Q S, ZANG X W, PAN X H, et al. Effects of temperature and concentration on characteristic parameters of methanol explosion [J]. Explosion and Shock Waves, 2019, 39(9): 095402. DOI: 10.11883/bzycj-2018-0121.
[2]	SAEED K. Determination of the explosion characteristics of methanol-air mixture in a constant volume vessel [J]. Fuel, 2017, 210: 729–737. DOI: 10.1016/j.fuel.2017.09.004.
[3]	MITU M, BRANDES E. Explosion parameters of methanol-air mixtures [J]. Fuel, 2015, 158: 217–223. DOI: 10.1016/j.fuel.2015.05.024.
[4]	GRABARCZYK M, TEODORCZYK A, SARLI V D, et al. Effect of initial temperature on the explosion pressure of various liquid fuels and their blends [J]. Journal of Loss Prevention in the Process Industries, 2016, 44: 775–779. DOI: 10.1016/j.jlp.2016.08.013.
[5]	WANG G, LI Y, LI L, et al. Experimental and theoretical investigation on cellular instability of methanol/air flames [J]. Fuel, 2018, 225: 95–103. DOI: 10.1016/j.fuel.2018.03.160.
[6]	ZUO Z, PEI Y, QIN J, et al. Laminar burning characteristics of premixed methane-dissociated methanol-air mixtures under lean burn conditions [J]. Applied Thermal Engineering, 2018, 140: 304–312. DOI: 10.1016/j.applthermaleng.2018.05.040.
[7]	秦静, 徐鹤, 裴毅强, 等. 初始温度和初始压力对甲烷-甲醇裂解气预混层流燃烧特性的影响 [J]. 吉林大学学报(工学版), 2018, 48(5): 1475–1482. DOI: 10.13229/j.cnki.jdxbgxb20170847. QIN J, XU H, PEI Y Q, et al. Influence of initial temperature and initial pressure on premixed laminar burning characteristics of methane-dissociated methanol flames [J]. Journal of Jilin University (Engineering and Technology Edition), 2018, 48(5): 1475–1482. DOI: 10.13229/j.cnki.jdxbgxb20170847.
[8]	张琰, 尼华, 张欣, 等. 二氯甲烷和甲醇混合物爆炸下限的试验研究 [J]. 消防科学与技术, 2018, 37(8): 1020–1023. DOI: 10.3969/j.issn.1009-0029.2018.08.003. ZHANG Y, NI H, ZHANG X, et al. Experimental study on lower explosive limits of dichloromethane-methanol blends [J]. Fire Science and Technology, 2018, 37(8): 1020–1023. DOI: 10.3969/j.issn.1009-0029.2018.08.003.
[9]	孙彦龙, 谭迎新, 谢溢月, 等. 甲醇汽油混合物爆炸下限测试研究 [J]. 中国安全科学学报, 2015, 25(12): 56–61. DOI: 10.16265 / j.cnki.issn1003-3033.2015.12.010. SUN Y L, TAN Y X, XIE Y Y, et al. Study on lower explosive limits of methanol-gasoline blends [J]. China Safety Science Journal, 2015, 25(12): 56–61. DOI: 10.16265 / j.cnki.issn1003-3033.2015.12.010.
[10]	刘金彪, 谭迎新, 于金升, 等. 氮气与二氧化碳对甲醇爆炸极限的影响 [J]. 测试技术学报, 2017, 31(6): 546–550. DOI: 1671-7449(2017)-06-0546-05. LIU J B, TAN Y X, YU J S, et al. Influence of nitrogen and carbon dioxide on methanol explosion limit [J]. Journal of Test and Measurement Technology, 2017, 31(6): 546–550. DOI: 1671-7449(2017)-06-0546-05.
[11]	BEECKMANNN J, CAI L, PITSCH H. Experimental investigation of the laminar burning velocities of methanol, ethanol, n-propanol, and n-butanol at high pressure [J]. Fuel, 2014, 117(1): 340–350. DOI: 10.1016/j.fuel.2013.09.025.
[12]	ZHANG X, WANG G, ZOU J, et al. Investigation on the oxidation chemistry of methanol in laminar premixed flames [J]. Combustion & Flame, 2017, 180: 20–31. DOI: 10.1016/j.combustflame.2017.02.016.
[13]	陈长坤, 王玮玉, 刘晅亚, 等. 隧道内甲醇液体蒸发及蒸气扩散规律数值模拟分析 [J]. 中国安全生产科学技术, 2017(12): 52–57. DOI: 1673-193X(2017)-12-0052-06. CHEN C K, WANG W Y, LIU X Y, et al. Numerical simulation analysis on evaporation of methanol liquid and diffusion laws of methanol vapor in tunnel [J]. Journal of Safety Science and Technology, 2017(12): 52–57. DOI: 1673-193X(2017)-12-0052-06.
[14]	解立峰, 李斌, 沈正祥, 等. 可燃液体爆燃特性及其抑制实验 [J]. 爆炸与冲击, 2009, 29(6): 659–664. DOI: 10.11883/1001-1455(2009)06-0659-06. XIE L F, LI B, SHEN Z X, et al. Experiment on combustion and detonation characteristics and its suppression for liquid vapor [J]. Explosion and Shock Waves, 2009, 29(6): 659–664. DOI: 10.11883/1001-1455(2009)06-0659-06.
[15]	尤祖明, 祝逢春, 王永旭, 等. 模拟高原环境条件下C₅-C₆燃料的爆轰特性研究 [J]. 爆炸与冲击, 2018, 38(6): 1303–1309. DOI: 10.11883/bzycj-2017-0185. YOU Z M, ZHU F C, WANG Y X, et al. Detonation characteristics of C₅-C₆ fuels under simulated plateau-condition [J]. Explosion and Shock Waves, 2018, 38(6): 1303–1309. DOI: 10.11883/bzycj-2017-0185.
[16]	高岩. 粒子场数字全息测量方法研究[D]. 天津: 天津大学, 2008: 25−28. DOI: 10.7666/d.y1530820.
[17]	余留芳, 李磊, 严晓芳, 等. 喷嘴结构对液体喷射破碎粒径影响的实验研究 [J]. 科学技术与工程, 2018, 18(18): 151–155. DOI: 10.3969/j.issn.1671-1815.2018.18.023. YU L F, LI L, YAN X F, et al. Experiment study on droplet size of liquid jet under different nozzle structure conditions [J]. ScienceTechnology and Engineering, 2018, 18(18): 151–155. DOI: 10.3969/j.issn.1671-1815.2018.18.023.
[18]	蒋军成. 化工安全[M]. 北京: 机械工业出版社, 2008: 60−65.