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个人信息Personal Information
副教授
博士生导师
硕士生导师
性别:男
毕业院校:中国科学技术大学
学位:博士
所在单位:化工学院
学科:安全科学与工程
联系方式:hycong@dlut.edu.cn
电子邮箱:hycong@dlut.edu.cn
Flame suppression mechanism of aluminum dust cloud by melamine cyanurate and melamine polyphosphate
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论文类型:期刊论文
发表时间:2019-02-01
发表刊物:Journal of hazardous materials
收录刊物:PubMed
卷号:368
页面范围:797-810
ISSN号:1873-3336
关键字:Aluminum dust,Flame propagation behaviors,Flame temperatures,Suppression mechanism
摘要:The suppression effect of melamine cyanurate (MCA) and melamine polyphosphate (MPP) on the flame propagation of aluminum dust were studied experimentally. The results indicated that the concentration of MPP required to supress the aluminum dust explosion was lower than MCA. As the concentration of suppressant increased, the acceleration and the maximum flame speed extremely decreased, and the flame morphology became isolated spot flames. The MPP addition exerted a stronger suppression effect on the temperature of aluminum flame compared to MCA addition. Meanwhile, the mechanism of flame suppression was further investigated. Decomposition of MCA and MPP particles could absorb the heat released from the flame front. Scanning electron microscopy demonstrated that the gas phase reaction of aluminum particles was suppressed by MCA and MPP, resulting in a larger particle size of the explosion products. XRD results indicated that MCA and MPP did not react with aluminum. Gaseous products of suppressant decomposition altered flame chemistry by radically recombining O atom and reducing AlO, which resulted in less amount of heat release, lower flame speed and lower flame temperature.Copyright © 2019 Elsevier B.V. All rights reserved.