CAJ | 학술논문

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6 μm的镁粉,在分散压力恒定为0.1 MPa时,镁粉浓度由424 g/m~3变化到5 085 g/m~3,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.
채용표준장치Godbert-Greenwald항온로측시료불동조건하미분진운최저착화온도.실험측시결과현시:D50위6、47、104、173μm시미분진운최저착화온도분별위480、520、620、＞700℃;선취D50위6 μm적미분,재분산압력항정위0.1 MPa시,미분농도유424 g/m~3변화도5 085 g/m~3,분진운최저착화온도유600℃강저도480℃;이분진질량항정위0.3 g시,분산압력종0.1 MPa증가도0.2 MPa,분진운최저착화온도유540℃승고도580℃.환분석료미분립경、농도급분산압력대분진운최저착화온도적영향.
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 D_(50) of 6, 47, 104 and 173 Mm are 480,520,620,>700℃ , respectively. Take the magnesium powder with the grain diameter of 6 pm 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.