镁粉尘云最低着火温度的实验测试  

Measurement of minimum ignition temperature for magnesium dust cloud

作　　者：钟英鹏[1] 徐冬[1] 李刚[1] 苑春苗[1] 陈宝智[1] 

机构地区：[1]东北大学火灾爆炸防治实验室,辽宁沈阳110004

出　　处：《爆炸与冲击》2009年第4期429-433,共5页Explosion and Shock Waves

基　　金：国家自然科学基金项目(50674023)

摘　　要：采用标准装置Godbert-Greenwald恒温炉测试了不同条件下镁粉尘云最低着火温度。实验测试结果显示:D50为6、47、104、173μm时镁粉尘云最低着火温度分别为480、520、620、>700℃;选取D50为6μm的镁粉,在分散压力恒定为0.1 MPa时,镁粉浓度由424 g/m3变化到5085 g/m3,粉尘云最低着火温度由600℃降低到480℃;而粉尘质量恒定为0.3 g时,分散压力从0.1 MPa增加到0.2 MPa,粉尘云最低着火温度由540℃升高到580℃。还分析了镁粉粒径、浓度及分散压力对粉尘云最低着火温度的影响。A standard Godbert-Greenwald furnace apparatus was used to measure minimum ignition temperatures of magnesium dust cloud under different conditions. Experimental results reveal that corresponding minimum ignition temperatures of dust cloud for four magnesium specimens with the medium grain diameters D50 of 6, 47, 104 and 173 μm are 480,520,620,〉700℃, respectively. Take the magnesium powder with the grain diameter of 6 μm for example, under the constant diffusing pressure of 0. 1 MPa, the minimum ignition temperature of the magnesium dust cloud decreases from 600℃ to 480 ℃ corresponding to the dust concentration changing from 424 g/m^3 to 5 085 g/m^3 ; and for the constant dust mass of 0.3 g, when the diffusing pressure increase from 0.1 MPa to 0.2 MPa, the minimum ignition temperature of this magnesium dust cloud increases from 540 ℃ to 580℃. And effects of grain diameter distribution, concentration and diffusing pressure on the minimum ignition temperature of magnesium dust cloud were analyzed by the above experimental results. It is helpful in the explosion-proof equipment design for the magnesium powder production.

关 键 词：爆炸力学 粉尘云最低着火温度 G-G恒温炉 镁粉 粒径 浓度 分散压力 

分 类 号：O381[理学—流体力学] X932[理学—力学]