Effect of N2-water mist-slip device on methane explosion characteristics

doi:10.16265/j.cnki.issn1003-3033.2022.10.1861

Abstract

Abstract:

In order to further explore the synergistic explosion suppression effect among various explosion suppression technologies, the methane explosion characteristics under the combined action of no pressure (0 MPa), low pressure (0.1, 0.2 MPa) nitrogen-water mist and different elastic coefficients (0.42, 0.81 N/mm) limit slip devices were carried out on a self-built 100 mm×100 mm×1 000 mm square pipeline explosion platform. The results show that the development of the "tulip"\|shaped flame structure is hindered by the coupling effect of the nitrogen-containing water mist and the sliding device, the sliding device makes the combustion zone form a variable-capacity restricted space, its volume is proportional to the flame propagation speed, the explosion overpressure in each working condition decayed, and the decay rate of the burned area was slightly greater than that of the unburned area. Under the action of 0.1 MPa nitrogen-water mist under the two elastic coefficients, the overpressure peak in the burned area decreased by 12.92% and 16.07%, respectively, and the overpressure peak in the unburned area decreased by 11.97% and 15.12%, respectively.

Key words: methane explosion, N₂, water mist, slipping device, variable capacity restricted space

DUAN Yulong, BU Yunbing, LONG Fengying, LI Yuanbing, HUANG Jun, YU Shuwei. Effect of N₂-water mist-slip device on methane explosion characteristics[J]. China Safety Science Journal, 2022, 32(10): 83-89.

Figures/Tables 11

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References 18

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压力/ MPa	喷雾接触火焰时间/ms	火焰回退时间/ms	火焰焠熄时间/ms
0	—	85	190
0.1	41	81	154
0.2	40	83	160

压力/ MPa	喷雾接触火焰时间/ms	火焰回退时间/ms	火焰焠熄时间/ms
0	—	78	140
0.1	41.5	72	145
0.2	42	73	155

C_e/ (N·mm^-1)	压力/ MPa	速度峰值/ (m·s^-1)	峰值下降率/%
0.42	0	12.53	0
	0.1	12.99	-3.67
	0.2	13.36	-6.62
C_e/ (N·mm^-1)	压力/ MPa	速度峰值/ (m·s^-1)	峰值下降率/%
0.81	0	13.74	0
	0.1	12.07	12.15
	0.2	12.67	7.79

C_e/ (N·mm^-1)	压力/ MPa	P'₁/ kPa	P'₁下降率/%	P'₂/ kPa	P'₂下降率/%
0.42	0	19.51	0	14.28	0
	0.1	16.99	12.92	12.57	11.97
	0.2	18.15	6.97	13.36	6.44
C_e/ (N·mm^-1)	压力/ MPa	P″₁/ kPa	P″₁下降率/%	P″₂/ kPa	P″₂下降率/%
0.81	0	23.64	0	13.82	0
	0.1	19.84	16.07	11.73	15.12
	0.2	21.61	8.59	12.68	8.25

Effect of N₂-water mist-slip device on methane explosion characteristics

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序号	C_e/ (N·mm^-1)	压力/ MPa	雾通量/ (g·min^-1)
1	0.42	0	0
2	0.42	0.1	109.74
3	0.42	0.2	149.60
4	0.81	0	0
5	0.81	0.1	109.74
6	0.81	0.2	149.60

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