Study on characteristics of potassium salt powder in inhibiting gas explosion overpressure

doi:10.16265/j.cnki.issn1003-3033.2025.07.1624

Abstract

Abstract:

To prevent and contain mine gas explosion accidents, the explosion suppression performance of potassium salt powders and their action laws in the pipe network were deeply explored. In a pipe network with parallel pipelines, branching pipelines, and angular connecting pipelines, an experimental study on the suppression of gas explosions by three potassium salt powders, namely KHCO₃, K₂C₂O₄, and KH₂PO₄, driven by N₂, was carried out. The pyrolysis characteristics of the powders were studied through thermogravimetric(TG) analysis. By combining explosion experiments, the overpressure changes were monitored. The explosion overpressure and overpressure attenuation coefficient under the action of potassium salt powder were explored. Moreover, the explosion suppression mechanism was analyzed with the assistance of the Chemkin-Pro simulation software. The results indicate that after the explosion suppression by the three powders, the superposition and attenuation process of the shock wave pressure is eliminated, and the overpressure time-history curve exhibits a "single peak value" characteristic. Among them, the KHCO₃ powder has the best suppression effect on the explosion overpressure peak value, with a decrease range of 83.2% - 88.9%. K₂C₂O₄ ranks second, and KH₂PO₄ is relatively weaker. The pressure attenuation degree in the oblique angular connecting branch pipe 4 is greater than that in other branch pipes. Both the branch pipe 4 and the turning section can leverage their own structural characteristics to enhance the overpressure attenuation effect, and they are regarded as preferred locations for installing explosive inhibitors. KHCO₃ is able to maximize the utilization of this structural characteristic to enhance the explosion suppression effect. Additionally, the shock wave overpressure attenuation coefficient K₂ of the branch pipeline section shows a situation where it is less than 1.This phenomenon is found to be exacerbated by the addition of K₂C₂O₄ and KH₂PO₄ powders. Through the analysis using the Chemkin-Pro simulation software, it is concluded that the free radical content under the KHCO₃ working condition is the lowest, and the explosion suppression effect is the best, followed by the K₂C₂O₄ working condition, and finally the KH₂PO₄ working condition.

Key words: potassium salt powder, gas explosion, explosion overpressure, overpressure attenuation, pipe network

CLC Number:

X932爆炸安全与防火、防爆

JIA Jinzhang, TIAN Xiuyuan. Study on characteristics of potassium salt powder in inhibiting gas explosion overpressure[J]. China Safety Science Journal, 2025, 35(7): 48-56.

Figures/Tables 8

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Table 1

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References 21

[1]	孙慧敏. 采空区中多元惰性气体对瓦斯爆炸特性的影响规律研究[D]. 阜新: 辽宁工程技术大学, 2024.
	SUN Huimin. Research on the influence of multivariate inert gas on the properties of gas explosion in mined-out areas[D]. Fuxin:Liaoning Technical University, 2024.
[2]	田思雨. 碱金属改性干水材料对瓦斯(煤尘)爆炸的抑隔爆特性研究[D]. 徐州: 中国矿业大学, 2024.
	TIAN Siyu. Research on the suppression and isolation characteristics of alkali metal-modified dry water materials for gas (coal dust) explosions[D]. Xuzhou: China University of Mining and Technology, 2024.
[3]	WANG Tao, YANG Zhe, YANG Peng, et al. The deflagration suppression effect of ammonium salt-modified dry water on methane-air mixtures: an experimental investigation[J]. Powder Technology, 2024, 434: DOI:10.1016/j.powtec.2023.119313.
[4]	YU Minggao, WANG Xueyan, ZHENG Kai, et al. Investigation of methane/air explosion suppression by modified montmorillonite inhibitor[J]. Process Safety and Environmental Protection, 2020, 144(1): DOI: 10.1016/j.psep.2020.07.050.
[5]	张莉聪, 李斯曼. 基于基元反应的气液两相协同抑爆阻燃效果分析[J]. 中国安全科学学报, 2024, 34(3):101-108. doi: 10.16265/j.cnki.issn1003-3033.2024.03.1169
	ZHANG Licong, LI Siman. Analysis of gas-liquid two-phase coordinated explosion and explosion flame retardant effect based on fundamental reaction[J]. China Safety Science Journal, 2024, 34(3):101-108. doi: 10.16265/j.cnki.issn1003-3033.2024.03.1169
[6]	贾进章, 田秀媛. 瓦斯爆炸抑制研究进展及发展趋势[J]. 安全与环境学报, 2025, 25(1):95-107.
	JIA Jinzhang, TIAN Xiuyuan. Progress and development trends in gas explosion suppression research[J]. Journal of Safety and Environment, 2025, 25(1):95-107.
[7]	JING Qi, WANG Dan, LIU Qingming, et al. Inhibition effect and mechanism of ultra-fine water mist on CH₄/air detonation: quantitative research based on CFD technology[J]. Process Safety and Environmental Protection, 2021, 148(1):DOI:10.1016/j.psep.2020.10.007.
[8]	CAO Xingyan, WANG Zhirong, LU Yawei, et al. Numerical simulation of methane explosion suppression by ultrafine water mist in a confined space[J]. Tunnelling and Underground Space Technology, 2021, 109 (5):DOI:10.1016/j.tust.2020.103777.
[9]	LIANG Xiaoqing, ZHOU Xinying, LU Xiner, et al. Investigation on slag resource utilization: KHCO₃/modified slag composite powder applied to methane/air explosion suppression[J]. Powder Technology, 2024: DOI:10.1016/j.powtec.2024.119814.
[10]	WANG Yan, YANG Jingjing, HE Jia, et al. Inhibition effect of KHCO₃and KH₂PO₄ on ethylene explosion[J]. ACS Omega, 2023, 8(8): DOI:10.1021/acsomega.2c06894.
[11]	王燕, 林晨迪, 郑立刚, 等. 草酸盐粉体抑制甲烷爆炸的试验研究[J]. 安全与环境学报, 2020, 20(4):1327-1333.
	WANG Yan, LIN Chendi, ZHENG Ligang, et al. Experimental investigation into the inhibitive effect of the methane explosion via the oxalate powders[J]. Journal of Safety and Environment, 2020, 20(4):1327-1333.
[12]	WANG Yueying, ZHU Feihao, ZHOU Hailin, et al. Investigation in the fire suppression properties of KHCO₃ and K₂C₂O₄dry water incorporates core-shell structures[J]. Journal of Loss Prevention in the Process Industries, 2024, 87: DOI: 10.1016/j.jlp.2023.105205.
[13]	JIA Jinzhang, TIAN Xiuyuan, WANG Fengxiao. Study on the effect of KHCO₃ particle size and powder spraying pressure on the methane explosion suppression characteristics of pipe networks[J]. ACS Omega, 2022, 36(7): DOI:10.1021/acsomega.2c02945.
[14]	王晓玲, 刘震起. 甲烷-空气预混区外含钾细水雾抑爆特性研究[J]. 中国安全科学学报, 2024, 34(1):150-157. doi: 10.16265/j.cnki.issn1003-3033.2024.01.0695
	WANG Xiaoling, LIU Zhenqi. Study on explosion suppression characteristics of water mist containing potassium compounds outside methane-air premixed area[J]. China Safety Science Journal, 2024, 34(1):150-157. doi: 10.16265/j.cnki.issn1003-3033.2024.01.0695
[15]	杨克, 李雪瑞, 纪虹, 等. 改性煤矸石-海藻酸钠粉体对管道内甲烷/空气爆炸的抑爆实验[J]. 爆炸与冲击, 2024, 44(7):174-187.
	YANG Ke, LI Xuerui, JI Hong, et al. Experimental on suppression of methane/air explosion in pipeline by modified gangue-sodium alginate powder[J]. Explosion and Shock Waves, 2024, 44(7):174-187.
[16]	ZHANG Yansong, ZHANG Youning, SHI Jing, et al. Experimental and numerical study on suppressing coal dust deflagration flame with NaHCO₃ and MPP[J]. Fuel, 2024, 358: DOI: 10.1016/j.fuel.2023.130152.
[17]	WEI Xiangrui, ZHANG Yansong, WU Guangan, et al. Study on explosion suppression of coal dust with different particle size by shell powder and NaHCO₃[J]. Fuel, 2021, 306: DOI: 10.1016/j.fuel.2021.121709.
[18]	余明高, 王雪燕, 郑凯, 等. 催化型复合粉体抑爆剂抑制瓦斯爆炸压力实验研究[J]. 煤炭学报, 2021, 46(10):3212-3220.
	YU Minggao, WANG Xueyan, ZHENG Kai, et al. Experimental investigation of gas explosion suppression by catalytic composite powder inhibitor[J]. Journal of China Coal Society, 2021, 46(10):3212-3220.
[19]	吴君安, 朱杭钦, 梁志星, 等. CO₂驱动下NaHCO₃对甲烷爆炸特性的影响[J]. 安全与环境工程, 2024, 31(4):37-44.
	WU Jun'an, ZHU Hangqin, LIANG Zhixing, et al. Effect of NaHCO₃ on methane explosion characteristics driven by CO₂[J]. Safety and Environmental Engineering, 2024, 31(4):37-44.
[20]	CAI Chongchong, SU Yang, WANG Yan, et al. Suppressive effects of potassium salt modified dry water material on hydrogen/methane mixture explosion[J]. International Journal of Hydrogen Energy, 2024, 79: 537-550.
[21]	QIU Jinwei, JIANG Bingyou, TANG Mingyu, et al. Effect of different bend pipes on the propagation characteristics of premixed methane-air explosion in confined spaces[J]. Geofluids, 2021, 2021(10): DOI:10.1155/2021/6635156.

系数类型	无抑爆剂	KHCO₃	K₂C₂O₄	KH₂PO₄
K₁	T₁/T₂=1.076	1.118	1.154	1.071
	T₆/T₅=1.087	1.127	1.068	1.106
	T₉/T₁₀=1.070	1.132	1.125	1.090
	T₃/T₄=1.091	1.025	1.110	1.099
	T₈/T₇=1.097	1.148	1.136	1.132
K₂	T₁/T₈=1.110	1.226	1.217	1.102
	T₃/T₅=1.027	1.036	1.045	1.005
	T₉/T₆=0.960	0.968	0.957	0.942
	T₆/T₇=1.176	1.148	1.160	1.149
	T₅/T₇=1.045	1.018	1.086	1.039
K₃	T₂/T₃=1.097	1.193	1.054	1.116
M	T₉/T₁=0.872	0.789	0.803	0.867
	T₈/T₂=0.969	0.912	0.948	0.972
	T₅/T₄=1.063	1.375	1.100	1.093
	T₆/T₁₀=1.117	1.170	1.175	1.162
	T₇/T₅=0.982	0.982	0.920	0.963