Fire hazard potential of non-metallic powder layers induced by deposit surfaces
Fire hazard potential of non-metallic powder layers induced by deposit surfaces
复制标题
沉积表面引起的非金属粉末层的潜在火灾危险
DOI：
10.1016/j.firesaf.2021.103365
复制
发表时间：
2021-04-25
影响因子：
3.1
通讯作者：
Yuan, Chunmiao
中科院分区：
文献类型：
--
作者：
Cai, Jingzhi;Li, Chang;Yuan, Chunmiao
可燃性粉尘可能导致灾难性的粉尘爆炸，其事故后果比可燃性气体或蒸气大得多。考虑到粉尘层火灾对粉尘爆炸的重要贡献，对粉尘层火灾危险性进行了研究，阐明了存款表面性质可能导致的粉尘层火灾危险性恶化情况。结果表明，即使是同一种粉体材料，存款表面导热系数对层间火灾危险性的影响也是复杂的，取决于导热系数对层间火焰传播的贡献。存款表面的良好渗透性（例如，金属网）可能导致具有高火焰高度和温度的底部火灾。对于任何存款表面（即，陶瓷和金属板，或金属网），粉尘层的倾斜角度可导致高火焰传播速度（FSV）。结果表明，良好的透气性存款表面加上较大的倾斜角度将显着增加粉尘层的火灾危险性，这在粉末加工行业或公共活动中使用可燃粉末时应给予足够的考虑。
Combustible dust may result in a catastrophic dust explosion with much larger accident consequences than that of combustible gas or vapors. By considering the significant contribution of dust layer fire to dust explosion, fire hazards of dust layer were investigated to clarify the possible worsening situation induced by the properties of deposit surface. The results showed that the effect of thermal conductivity of deposit surface on layer fire hazard was complex even for the same powder material, which depended on the contribution of conductivity to the layer flame spreading. Good permeability of the deposit surfaces (e.g., metal gauze) could contribute to a bottom fire with high flame height and temperature. For whatever deposit surfaces (i.e., ceramic and metal plate, or metal gauze), the inclination angle of the dust layer could result in a high flame spread velocity (FSV). As a result, good permeability deposit surfaces coupled with a large inclination angle would significantly enhance the fire hazard of the dust layer, which should be taken enough consideration in the powder process industries or public activities where combustible powders were used.