Experimental investigation on the spread of aqueous foam over ethanol surface

doi:10.1016/j.cjche.2020.07.028

摘要/Abstract

摘要： The presence of ethanol has an adverse effect on foam spreading, and ethanol fire is difficult to extinguish with aqueous fire-fighting foams. Thus, it is necessary to explore the foam formulation suitable for ethanol fuels and study the spreading behavior of foam over ethanol surface. In the current work, stable foams based on hydrocarbon surfactant (SDS), fluorocarbon surfactant (FC1157), and polymers (XG) were prepared by using the compressed-air foam system. The spreading behaviors of foam on polar ethanol and non-polar heptane surface were observed and compared. Furthermore, the effects of stabilizer concentrations, foam flow rates and expansion ratios on foam spreading performance were investigated, respectively. The results indicate that aqueous SDS foam can spread on the heptane layer continuously, but it is difficult to cover the ethanol surface. The addition of XG and FC1157 can synergistically improve the spreading performance of aqueous foam over ethanol. Depending on stabilizer concentrations, there are remarkable differences in foam spreading behaviors. Besides, different foam application parameters including expansion ratios and foam flow rates significantly affect the foam spreading rate, despite the same foam formulation. The research methods and results guide the optimal design of foam formulations as well as the practical application of aqueous foam for ethanol fire extinguishment.

关键词: Aqueous foam, Ethanol, Spreading behavior, Fluorocarbon surfactant, Xanthan gum polymer

Abstract: The presence of ethanol has an adverse effect on foam spreading, and ethanol fire is difficult to extinguish with aqueous fire-fighting foams. Thus, it is necessary to explore the foam formulation suitable for ethanol fuels and study the spreading behavior of foam over ethanol surface. In the current work, stable foams based on hydrocarbon surfactant (SDS), fluorocarbon surfactant (FC1157), and polymers (XG) were prepared by using the compressed-air foam system. The spreading behaviors of foam on polar ethanol and non-polar heptane surface were observed and compared. Furthermore, the effects of stabilizer concentrations, foam flow rates and expansion ratios on foam spreading performance were investigated, respectively. The results indicate that aqueous SDS foam can spread on the heptane layer continuously, but it is difficult to cover the ethanol surface. The addition of XG and FC1157 can synergistically improve the spreading performance of aqueous foam over ethanol. Depending on stabilizer concentrations, there are remarkable differences in foam spreading behaviors. Besides, different foam application parameters including expansion ratios and foam flow rates significantly affect the foam spreading rate, despite the same foam formulation. The research methods and results guide the optimal design of foam formulations as well as the practical application of aqueous foam for ethanol fire extinguishment.

Key words: Aqueous foam, Ethanol, Spreading behavior, Fluorocarbon surfactant, Xanthan gum polymer

Xiaoyang Yu, Fan Li, Xuyang Miao, Ning Jiang, Ruowen Zong, Shouxiang Lu, Changhai Li. Experimental investigation on the spread of aqueous foam over ethanol surface[J]. 中国化学工程学报, 2020, 28(11): 2946-2954.

Xiaoyang Yu, Fan Li, Xuyang Miao, Ning Jiang, Ruowen Zong, Shouxiang Lu, Changhai Li. Experimental investigation on the spread of aqueous foam over ethanol surface[J]. Chinese Journal of Chemical Engineering, 2020, 28(11): 2946-2954.

参考文献

[1] S. Kumar, A. Mandal, Investigation on stabilization of CO₂ foam by ionic and nonionic surfactants in presence of different additives for application in enhanced oil recovery, Appl. Surf. Sci. 420(2017) 9-20.
[2] V. Kumar, N. Pal, A.K. Jangir, D.L. Manyala, D. Varade, A. Mandal, K. Kuperkar, Dynamic interfacial properties and tuning aqueous foamability stabilized by cationic surfactants in terms of their structural hydrophobicity, free drainage and bubble extent, Colloids Surf. A Physicochem. Eng. Asp. 588(2020), 124362,.
[3] X.Y. Yu, N. Jiang, X.Y. Miao, R.W. Zong, Y.J. Sheng, C.H. Li, S.X. Lu, Formation of stable aqueous foams on the ethanol layer:Synergistic stabilization of fluorosurfactant and polymers, Colloids Surf. A Physicochem. Eng. Asp. 591(2020), 124545,.
[4] Q.L. Shi, B.T. Qin, Experimental research on gel-stabilized foam designed to prevent and control spontaneous combustion of coal, Fuel 254(2019), 115558,.
[5] K.M. Hinnant, S.L. Giles, R. Ananth, Measuring fuel transport through fluorocarbon and fluorine-free firefighting foams, Fire Saf. J. 91(2017) 653-661.
[6] Y.J. Sheng, N. Jiang, S.X. Lu, C.H. Li, Fluorinated and fluorine-free firefighting foams spread on heptane surface, Colloids Surf. A Physicochem. Eng. Asp. 552(2018) 1-8.
[7] X.Y. Yu, N. Jiang, X.Y. Miao, F. Li, J.Y. Wang, R.W. Zong, S.X. Lu, Comparative studies on foam stability, oil-film interaction and fire extinguishing performance for fluorine-free and fluorinated foams, Process. Saf. Environ. Prot. 133(2020) 201-215.
[8] K.M. Hinnant, M.W. Conroy, R. Ananth, Influence of fuel on foam degradation for fluorinated and fluorine-free foams, Colloids Surf. A Physicochem. Eng. Asp. 522(2017) 1-17.
[9] S.J. Dong, X.X. Lu, D.M. Wang, H.T. Wang, K.M. Zheng, Q. Shi, M.J. Chen, Experimental investigation of the fire-fighting characteristics of aqueous foam in underground goaf, Process. Saf. Environ. Prot. 106(2017) 239-245.
[10] Y.J. Sheng, N. Jiang, X.X. Sun, S.X. Lu, C.H. Li, Experimental study on effect of foam stabilizers on aqueous film-forming foam, Fire. Technol 54(2018) 211-218.
[11] S.A. Magrabi, B.Z. Dlugogorski, G.J. Jameson, A comparative study of drainage characteristics in AFFF and FFFP compressed-air fire-fighting foams, Fire Saf. J. 37(2002) 21-52.
[12] A.J. Laundess, M.S. Rayson, B.Z. Dlugogorski, E.M. Kennedy, Suppression performance comparison for aspirated, compressed-air and in situ chemically generated class B foams, Fire. Technol 48(2012) 625-640.
[13] X.H. Jia, Y.Z. Luo, R. Huang, H.D. Bo, Q.Y. Liu, X.H. Zhu, Spreading kinetics of fluorocarbon surfactants on several liquid fuels surfaces, Colloids Surf. A Physicochem. Eng. Asp. 589(2020), 124441.
[14] S. Paul, Foam Engineering Fundamentals and Applications, A John Wiley Sons Ltd, Publication, 2012.
[15] E.C. Norman, A.C. Regina, Alcohol resistant aqueous film forming firefighting foam, US patent 5,207,932, May 4, 1993.
[16] B. Persson, M. Dahlberg, A simple model for predicting foam spread over liquids, Fire Saf. Sci. 4(1994) 265-276.
[17] B.Y. Lattimer, J. Trelles, Foam spread over a liquid pool, Fire Saf. J. 42(2007) 249-264.
[18] K.M. Hinnant, S.L. Giles, A.W. Snow, J.P. Farley, J.W. Fleming, R. Ananth, Ananalytically defined fire suppressing foam formulation for evaluation of fluorosurfactant replacement, J. Surfactant Deterg. 21(2018) 711-722.
[19] C. Hill, A. Czajka, G. Hazell, I. Grillo, S.E. Rogers, M.W.A. Skoda, N. Joslin, J. Payne, J. Eastoe, Surface and bulk properties of surfactants used in fire-fighting, J. Colloid Interface Sci. 530(2018) 686-694.
[20] Y.B. Wu, W. Ding, Q. He, The gelation properties of tara gum blended with kcarrageenan or xanthan, Food Hydrocoll. 77(2018) 764-771.
[21] D.A. Migliore, M. Matteucci, M. Naccari, A revaluation of frame difference in fast and robust motion detection, Proceedings of the 4th ACM International Workshop on Video Surveillance and Sensor Networks (2006) 215-218.
[22] M.Y. Zhao, Z. Jun, S.G. Zhao, W. Yuan, A novel method for moving object detection in intelligent video surveillance systems, International Conference on IEEE. 2(2016) 1797-1800.
[23] W.D. Harkins, A. Feldman, Films:the spreading of liquids and the spreading coefficient, J. Am. Chem. Soc. 44(1992) 2665-2685.
[24] X.T. Hu, H.D. Goff, Fractionation of polysaccharides by gradient non-solvent precipitation:a review, Trends Food Sci. Tech. 81(2018) 108-115.
[25] X.T. Hu, C.M. Liu, Z.Y. Jin, Y.Q. Tian, Fractionation of starch hydrolysate into dextrin fractions with low dispersity by gradient alcohol precipitation, Sep. Purif. Technol. 151(2015) 201-210.
[26] M.P. Krafft, J.G. Riess, Chemistry, physical chemistry, and uses of molecular fluorocarbon-hydrocarbon diblocks, triblocks, and related compounds unique a polar components for self-assembled colloid and interface engineering, Chem. Rev. 109(2009) 1714-1792.
[27] J.G. Corrie, Measuring the Shear Stress of Fire-Fighting Foams. Fire Research Note 1055, Borehamwood, Fire Research Station, 1976.
[28] R. Ananth, A.W. Snow, K.M. Hinnant, S.L. Giles, J.P. Farley, Synergisms between siloxane-polyoxyethylene and alkyl polyglycoside surfactants in foam stability and pool fire extinction, Colloids Surf. A Physicochem. Eng. Asp. 579(2019), 123686.
[29] S.L. Giles, A.W. Snow, K.M. Hinnant, R. Ananth, Modulation of fluorocarbon surfactant diffusion with diethylene glycol butyl ether for improved foam characteristics and fire suppression, Colloids Surf. A Physicochem. Eng. Asp. 579(2019), 123660.
[30] A.J. Laundess, M.S. Rayson, B.Z. Dlugogorski, E.M. Kennedy, Small-scale test protocol for firefighting foams DEF(AUST)5706:effect of bubble size distribution and expansion ratio, Fire. Technol 47(2011) 149-162.
[31] B. Herzhaft, S. Kakadjian, M. Moan, Measurement and modeling of the flow behavior of aqueous foams using a recirculating pipe rheometer, Colloids Surf. A Physicochem. Eng. Asp. 263(2005) 153-164.
[32] F. Rouyer, S. Cohen-Addad, M. Vignes-Adler, R. Höhler, Dynamics of yielding observed in a three-dimensional aqueous dry foam, Phys. Rev. E 67(2003) 214051-214057.
[33] I. Cantat, S. Cohen-Addad, F. Elias, F. Graner, R. Hohler, O. Pitois, Foams-Structure and Dynamics, Oxford University Press, 2013.
[34] A. Saint-Jalmes, D.J. Durian, Vanishing elasticity for wet foams:equivalence with emulsions and role of polydispersity, J. Rheol. 43(1999) 1411-1422.
[35] T.G. Mason, J. Bibette, D.A. Weitz, Elasticity of compressed emulsions, Phys. Rev. Lett. 75(1995) 2051-2054.
[36] T. Gaillard, C. Honorez, M. Jumeau, F. Elias, W. Drenckhan, A simple technique for the automation of bubble size measurements, Colloids Surf. A Physicochem. Eng. Asp. 473(2015) 68-74.