关键词: 粉尘爆炸, 最低着火温度, 桑木粉尘, Godbert-Greenwald恒温炉, 着火敏感度参数

Abstract: In order to learn ignition sensitivity of mulberry wood dust and guarantee safe production, a standard Godbert-Greenwald furnace apparatus and a hot plate test device were used to carry out experiments on the dust. Influences of particle size,concentration of dust cloud,spray pressure and bulking thickness on the minimum ignition temperature of the dust were studied systematically. The results show that under the test conditions,the minimum ignition temperature of mulberry wood dust cloud decreases from 480 to 450 ℃ when particle size decreases from 80 to 140 mesh. The minimum ignition temperature of wood dust cloud decreases from 490 to 470 ℃ when dust concentration increases from 212 to 1 696 g/m³. When spray pressure increase from 0.02 to 0.1 MPa,the minimum ignition temperature of wood dust cloud decreases from 500 to 485 ℃. For bulking thickness of 5 mm, when particle size decreases from 80 to 140 mesh,the minimum ignition temperature of mulberry wood dust layer decreases from 360 to 325 ℃. For particle size of 100 mesh,the minimum ignition temperature of wood dust layer decreases from 390 to 340 ℃ when the bulking thickness increases from 1 to 7 mm. Within the same particle size range,the minimum ignition temperature of mulberry wood dust cloud is 120 ℃ higher than that of wood dust layer. Therefore, wood processing industry should refer to the corresponding value of the minimum ignition temperature of wood dust when selecting the explosion-proof electrical equipment, and take measures to avoid the accumulation of dust.

Key words: dust explosion, minimum ignition temperature, mulberry wood dust, Godbert-Greenwald furnace apparatus, ignition sensitivity parameters