Research on preparation of film-forming colloidal foam and its fire extinguishing and cooling characteristics

doi:10.16265/j.cnki.issn1003-3033.2022.10.2201

Abstract

Abstract:

Aiming at the poor stability and short time for oxygen isolation of the existing fire-extinguishing foams， the novel colloidal foam technology with long-lasting water retention and film-forming function has been developed. The influence of the composition ratio on the foaming and stability of colloidal foam， its film-forming characteristics， and its inhibition and extinguishment characteristics were analyzed. The results show that the prepared colloidal foam using 0.3% foaming agent， 0.4% thickening agent（TA）， and 0.3% crosslinking agent（CA）exhibited the best comprehensive performance with the half-life and expansion ratio above 120 h and 5 times respectively. Moreover， colloidal foam could wrap the high-site ignition sources quickly to cover and extinguish. In addition， there would be a dense colloidal oxygen barrier film formed from the drying colloidal foam on the surface of the coal， which achieved the long-lasting prevention and control of coal spontaneous combustion.

Key words: colloidal foam, stability, film formation, extinguishing and cooling, spontaneous combustion of coal, goaf

SHI Quanlin, YANG Hongqi, LI Hongbiao. Research on preparation of film-forming colloidal foam and its fire extinguishing and cooling characteristics[J]. China Safety Science Journal, 2022, 32(10): 121-126.

Figures/Tables 9

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

References 16

[1]	谭波, 邵壮壮, 郭岩, 等. 基于指标气体关联分析的煤自燃分级预警研究[J]. 中国安全科学学报, 2021, 31(2):33-39. doi: 10.16265/j.cnki.issn 1003-3033.2021.02.005
	TAN Bo, SHAO Zhuangzhuang, GUO Yan, et al. Research on grading and early warning of coal spontaneous combustionbased on correlation analysis of index gas[J]. China Safety Science Journal, 2021, 31(2):33-39. doi: 10.16265/j.cnki.issn 1003-3033.2021.02.005
[2]	王立杰, 王继仁, 张勋, 等. 采空区高位钻孔注浆防灭火浆液扩散特性研究[J]. 中国安全科学学报, 2019, 29(10):71-77. doi: 10.16265/j.cnki.issn1003-3033.2019.10.011
	WANG Lijie, WANG Jiren, ZHANG Xun, et al. Study on slurry diffusion law of high level drilling grouting fire prevention and control in goaf[J]. China Safety Science Journal, 2019, 29(10):71-77. doi: 10.16265/j.cnki.issn1003-3033.2019.10.011
[3]	TUTAK Magdalena, BRODNY Jarosław, SZURGACZ Dawid, et al. The impact of the ventilation system on the methane release hazard and spontaneous combustion of coal in the area of exploitation:a case study[J]. Energies, 2020, 13(18):Doi: 10.3390/en13184891. doi: 10.3390/en13184891
[4]	GUO Wenkai, CHEN Bing, LI Guangyao, et al. Ambient PM2.5 and related health impacts of spontaneous combustion of coal and coal gangue[J]. Environmental Science & Technology, 2021, 55(9):5763-5771. doi: 10.1021/acs.est.1c00150
[5]	ONIFADE M, GENC B. A review of research on spontaneous combustion of coal[J]. International Journal of Mining Science and Technology, 2020, 30(3):303-311. doi: 10.1016/j.ijmst.2020.03.001
[6]	邓军, 白祖锦, 肖旸, 等. 煤自燃灾害防治技术现状与挑战[J]. 煤矿安全, 2020, 51(10):118-125.
	DENG Jun, BAI Zujin, XIAO Yang, et al. Present situation and challenge of coal spontaneous combustion disasters prevention and control technology[J]. Safety in Coal Mines, 2020, 51(10):118-125.
[7]	SHI Quanlin, QIN Botao, HAO Yinghao, et al. Experimental investigation of the flow and extinguishment characteristics of gel-stabilized foam used to control coal fire[J]. Energy, 2022, 247:DOI:10.1016/j.energy.2022.123484. doi: 10.1016/j.energy.2022.123484
[8]	LU Yi, LIU Yilun, SHI Shiliang, et al. Micro-particles stabilized aqueous foam for coal spontaneous combustion control and its flow characteristics[J]. Process Safety and Environmental Protection, 2020, 139:262-272. doi: 10.1016/j.psep.2020.04.017
[9]	XUE Di, HU Xiangming, CHENG Weimin, et al. Fire prevention and control using gel-stabilization foam to inhibit spontaneous combustion of coal: characteristics and engineering applications[J]. Fuel, 2020, 264:DOI: 10.1016/j.fuel.2019.116903. doi: 10.1016/j.fuel.2019.116903
[10]	GUO Qing, REN Wanxing, ZHU Jintuo, et al. Study on the composition and structure of foamed gel for fire prevention and extinguishing in coal mines[J]. Process Safety and Environmental Protection, 2019, 128:176-183. doi: 10.1016/j.psep.2019.06.001
[11]	LI Min, WANG Deming, HE Shan, et al. Experimental study on foaming properties of anion-cation compound foaming agent to prevent coal spontaneous combustion[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019, 581:DOI: 10.1016/j.fuel.2019.116903. doi: 10.1016/j.fuel.2019.116903
[12]	STRACHER G B, TAYLOR T P. Coal fires burning out of control around the world: thermodynamic recipe for environmental catastrophe[J]. International Journal of Coal Geology, 2004, 59(1/2):7-17. doi: 10.1016/j.coal.2003.03.002
[13]	QIN Botao, LU Yi, LI Yong, et al. Aqueous three-phase foam supported by fly ash for coal spontaneous combustion prevention and control[J]. Advanced Powder Technology, 2014, 25(5):1527-1533. doi: 10.1016/j.apt.2014.04.010
[14]	ZHANG Leilin, SHI Biming, QIN Botao, et al. Characteristics of foamed gel for coal spontaneous combustion prevention and control[J]. Combustion Science and Technology, 2017, 189(6):980-990. doi: 10.1080/00102202.2016.1264942
[15]	路传波, 张炳花, 李丙成, 等. 两性/阴离子型表面活性剂协同增强起泡性能研究[J]. 石油化工高等学校学报, 2015, 28(4):55-58.
	LU Chuanbo, ZHANG Binghua, LI Bingcheng, et al. The synergetic enhancement foaming properties in mixed zwitterionic and anionic surfactant systems[J]. Journal of Petrochemical Universities, 2015, 28(4):55-58.
[16]	玄伟伟, 王倩, 张建胜. 褐煤自燃倾向测定及其低温氧化反应过程研究[J]. 煤炭学报, 2016, 41(10):2460-2465.
	XUAN Weiwei, WANG Qian, ZHANG Jiansheng. Spontaneous combustion propensity and low-temperature oxidation process of lignite[J]. Journal of China Coal Society, 2016, 41(10):2460-2465.