金属氧化物对镁粉尘层火蔓延的增强机制  

Enhanced Mechanism of Metal Oxides on the Fire Spread of Magnesium Dust Layer

作　　者：陈洋洋 孟凡一 蔡景治 苑春苗[1] CHEN Yang-yang;MENG Fan-yi;CAI Jing-zhi;YUAN Chun-miao(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China;China South-to-North Water Diversion Jianghan Water Network Construction and Development Co.,Ltd.,Wuhan 430040,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]中国南水北调集团江汉水网建设开发有限公司,湖北武汉430040

出　　处：《东北大学学报（自然科学版）》2023年第12期1778-1784,共7页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51974189,51874070);中央高校基本科研业务费专项资金资助项目(N2101003,N2101042)。

摘　　要：易分解的固体惰化剂会增加镁粉尘层的燃烧强度,为探究不易分解的金属氧化物对镁粉尘层燃烧是否具有抑制效应,选用TiO_(2),MgO,CaO进行实验研究.结果表明:TiO_(2),MgO,CaO在质量分数小于75%时均大幅增强镁粉尘层火蔓延的燃烧强度,火焰相态由纯镁粉尘层燃烧时的表面非均相燃烧转变为气相燃烧;TiO_(2)通过与镁粉发生化学反应增强火蔓延行为,在TiO_(2)和Mg恰好完全反应(TiO_(2)质量分数为63%)的工况下粉尘层火蔓延速率增加了50余倍;MgO,CaO通过增大镁粉颗粒间距,减缓了镁粉燃烧产物形成致密氧化层,从而增强镁粉尘层火蔓延行为.实际生产过程应高度关注镁粉尘与金属氧化物的接触工况,研究结果能够为镁粉尘防护提供理论基础.Solid inerting agents that readily decompose can intensify the combustion of the magnesium dust layers.In order to explore whether metal oxides that are less prone to decomposition can inhibit the combustion of the magnesium dust layers,TiO_2,MgO and CaO were used for experimental research.The results show that TiO_2,MgO and CaO significantly enhance the combustion intensity of the magnesium dust layer fire spread when the mass fraction is less than 75%,and the flame phase transitions from surface heterogeneous combustion of pure magnesium dust layers to gas phase combustion.TiO_(2) enhanced the fire spread behavior by chemical reaction with magnesium powder,and the fire spread rate of dust layer increased by more than 50 times under the condition of perfectly reacting between TiO_(2) and Mg(mass fraction of 63%).MgO and CaO enhance the fire spread behavior of the magnesium dust layer by increasing the particle spacing of magnesium powder and slowing down the formation of dense oxide layer.The actual production process should pay close attention to the contact conditions of magnesium dust and metal oxides,and the research results can provide a theoretical basis for magnesium dust protection.

关 键 词：粉尘层火灾 金属氧化物 镁粉尘 火蔓延速率 火焰形态 

分 类 号：TP20[自动化与计算机技术—检测技术与自动化装置]