Study on extinguishing efficiency in suppressing class A fire by gel-type core-shell particles

被引：0
|
作者：
Liu H. [1 ]
Zhang T. [1 ]
Xia D. [1 ]
Liang Q. [1 ]
Wang H. [2 ]
机构：
[1] Department of Fire Commanding, China People's Police University, Langfang, 065000, Hebei
[2] Key Laboratory of Firefighting and Rescue Technology, China People's Police University, Langfang, 065000, Hebei
来源：
Huagong Xuebao | 2019年 / 4卷 / 1652-1660期
关键词：
Class A; Core-shell structure; Efficiency; Gels; Powders; Preparation;
D O I：
10.11949/j.issn.0438-1157.20181259
中图分类号：
学科分类号：
摘要：
A new gel-type fire extinguishant with core-shell structure is designed which aims at the integrated innovation in the form of the extinguishant to overcome the shortcomings of environmental protection, efficiency and corrosiveness of traditional extinguishant. The gas-phase silicon dioxide, aqueous ammonium dihydrogen phosphate solution, gellan gum and methyl hydrogen silicone combined to prepare the extinguishant by high-speed shearing method. The pressure resistance and fire extinguishing effectiveness of the extinguishant are characterized, and the synergistic mechanism of the extinguishant is studied. The obtained results show that the damage rate is minimal when the size of as-prepared particles ranged between 100-200 μm and the exerting pressure is less than 1.2 MPa.The extinguishant has better performance in suppression class A fire and played a synergistic effect in the process of fire extinguishing: the water acts as an inert component which could evaporate rapidly and cool down the fuel; the ammonium dihydrogen phosphate acts as a chemical component which decomposed by heat absorption and capturer a dicals of the flame for cutting the chain reaction. The gel adheres to the wooden surface and forms an isolation layer, the smoldering and resurgence are inhibited by continuous cooling. Fire-extinguishing performance of gel-type core-shell structure powder fire extinguishing medium is better than that of ordinary ABC dry powder, and the cost is lower, which has a good application prospect. © All Right Reserved.
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页码：1652 / 1660
页数：8
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