摘要
为研究碳酸钙含量对木质粉尘层最低着火温度的影响,利用HY16430粉尘层引燃温度试验装置测定油磨木粉、人工打磨木粉及两者分别与碳酸钙混合的粉尘层最低着火温度。结果表明:油磨木粉、人工打磨木粉、碳酸钙中位粒径分别为7.344、7.269、7.859μm,堆积厚度为5 mm时,油磨木粉尘层最低着火温度为324℃,人工打磨木粉尘层最低着火温度为332℃。碳酸钙通过吸热加速热量消耗、减少氧浓度、降低木质粉尘浓度等方式,使木质粉尘层最低着火温度随碳酸钙含量的增加而升高。碳酸钙的质量分数达到40%时,油磨木粉、人工打磨木粉尘层最低着火温度急剧增大,均出现温度突变现象。碳酸钙的质量分数达到70%时,油磨木粉碳酸钙混合粉尘层最低着火温度较纯油磨木粉上升了17.3%,人工打磨木粉碳酸钙混合粉尘层最低着火温度较纯人工打磨木粉上升了18.7%。碳酸钙的质量分数达到80%时,热表面设置最高温度400℃,粉尘层均未着火。
In order to study the effect of calcium carbonate content on the minimum ignition temperature of wood dust layer,HY16430 dust layer ignition temperature test device was used to measure the minimum ignition temperature of polished painted wood dust layer,hand polished wood dust layer and their mixture with calcium carbonate respectively.The results showed that when the median particle sizes of polished painted wood powder,hand polished wood powder and calcium carbonate were 7.344,7.269 and 7.859μm,respectively,and the accumulated thickness of dust layer was 5 mm,the minimum ignition temperature of polished painted wood dust layer is 324℃,and that of hand polished wood is 332℃.The minimum ignition temperature of wood dust layer increases with the increase of calcium carbonate content by means of increasing heat absorption to accelerate heat consumption,reducing oxygen concentration and reducing wood dust concentration.When the mass fraction of calcium carbonate reaches 40%,the minimum ignition temperature of dust layer of polished painted wood and hand polished wood increase sharply,and the temperature mutation phenomenon appears.When the mass fraction of calcium carbonate reaches 70%,the minimum ignition temperature of the mixed dust layer of polished painted wood powder is 17.3%higher than that of the pure polished painted wood dust layer,and the minimum ignition temperature of the mixed dust layer of hand polished wood powder is 18.7%higher than that of the pure hand polished wood dust layer.When the mass fraction of calcium carbonate reaches 80%,the hot surface has been set to a maximum temperature of 400℃,but the dust layer does not ignite.
作者
吕鹏飞
赵静
赵浩森
庞磊
LV Peng-fei;ZHAO Jing;ZHAO Hao-sen;PANG Lei(School of Safety Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China;Beijing Academy of Safety Engineering and Technology,Beijing 102617,China)
出处
《消防科学与技术》
CAS
北大核心
2022年第2期169-173,共5页
Fire Science and Technology
基金
北京市科技新星计划项目(Z181100006218092)
国家级大学生研究训练[URT]计划项目(2020J00062)。
关键词
油磨木粉
人工打磨木粉
碳酸钙
最低着火温度
polished painted wood powder
hand polished wood powder
calcium carbonate
minimum ignition temperature
