X. M. Ni, S. G. Zhang, M. Zhao, X. S. Wang and K. Q. Kuang (2015) Experimental studies on the extinction of methane/air cup-burner flames with gas-solid composite particles. Journal/Fire Safety Journal 76 1-8. [In English]
Web link: http://dx.doi.org/10.1016/j.firesaf.2015.05.006
Keywords: Flame extinction, Cup-burner, Composite particles, Synergism, HF, DIFFUSION FLAMES, POWDER AEROSOLS, FIRES, EXTINGUISHMENT, SUPPRESSANTS, MECHANISMS, CF3BR
Abstract: Fire suppression effectiveness of gas-solid composite particles consisting of 2-bromo-3,3,3-trifluoropropene (BTP) and zeolite 13X was evaluated on a cup-burner apparatus with coflowing methane/air flame. A series of composite samples with the weight concentration of BTP (omega) varying from 1.0 to 12.0% were tested. For comparison, extinction measurements were also conducted using neat BTP and zeolite 13X, respectively. Results indicated that the composite particles on a mass basis were much more effective than that of BTP and zeolite 13X used alone. A synergistic effect was exhibited by the BTP/zeolite 13X composites, which was affected by the omega values. Furthermore, significantly reduced HF concentrations (<, 70 ppm) were detected in the suppression tests with the composite particles, in comparison to that of neat BTP (1436 ppm). The composite particles extinguished the flame through a blowoff process, in which the flame base oscillated, detached from the cup-burner rim and extinguished eventually. Mechanism of the composite particles in suppressing the cup burner flame was studied. (C) 2015 Elsevier Ltd. All rights reserved.

 ,