金属氧化物对镁粉尘层火蔓延的增强机制

doi:10.12068/j.issn.1005-3026.2023.12.014

东北大学学报（自然科学版） ›› 2023, Vol. 44 ›› Issue (12): 1778-1784.DOI: 10.12068/j.issn.1005-3026.2023.12.014

金属氧化物对镁粉尘层火蔓延的增强机制

陈洋洋^1,2，孟凡一¹，蔡景治¹，苑春苗¹

(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)

发布日期:2024-01-30
通讯作者: 陈洋洋
作者简介:陈洋洋(1998-)，男，河南周口人，东北大学硕士研究生；苑春苗(1978-)，男，河南周口人，东北大学教授，博士生导师.
基金资助:
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).

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

CHEN Yang-yang^1,2， MENG Fan-yi¹， CAI Jing-zhi¹， YUAN Chun-miao¹

1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China; 2. China South-to-North Water Diversion Jianghan Water Network Construction and Development Co.， Ltd.， Wuhan 430040，China.

Published:2024-01-30
Contact: YUAN Chun-miao
About author:-
Supported by:
-

摘要/Abstract

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TiO₂，MgO，CaO进行实验研究.结果表明:TiO₂，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；TiO₂通过与镁粉发生化学反应增强火蔓延行为，在TiO₂和Mg恰好完全反应(TiO₂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.

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

Abstract: 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， TiO₂， MgO and CaO were used for experimental research. The results show that TiO₂， 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. TiO₂ 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 TiO₂ 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.

Key words: dust layer fires; metal oxides; magnesium dust; fire spread velocity; flame form

中图分类号:

TP20

陈洋洋，孟凡一，蔡景治，苑春苗. 金属氧化物对镁粉尘层火蔓延的增强机制[J]. 东北大学学报（自然科学版）, 2023, 44(12): 1778-1784.

CHEN Yang-yang， MENG Fan-yi， CAI Jing-zhi， YUAN Chun-miao. Enhanced Mechanism of Metal Oxides on the Fire Spread of Magnesium Dust Layer[J]. Journal of Northeastern University(Natural Science), 2023, 44(12): 1778-1784.

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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

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