文档介绍：合金粉最低着火温度随着碳酸钙质量分数的增加而增大,且当碳酸钙质量分数达到
%,抑制效果明显增强,镁铝合金粉最低着火温度显著升高;煤粉最低着火温度则在惰性介质质量分数达到 %时显著升高。
(5)环境湿度对可燃粉尘最低着火温度也有一定的影响,随着环境湿度的增加, 粉尘最低着火温度增大,能够有效抑制粉尘燃烧。湿度对木粉最低着火温度的影响最大, 试验测得,环境湿度为 43%、57%和 69%时,木粉最低着火温度分别为 474 ℃、523 ℃和 552 ℃。
关键词:最低着火温度,可燃粉尘,粉尘爆炸,惰性粉尘
Research on the Minimum Ignition Temperature bustible Dusts
Abstract
In the dust manufacturing, processing and other projects, once bustible dust disperses and suspends in the air, then the ignition source exists, it is possible to explode. In recent years, with the continuous production process and dust usage is increasing year by year, dust explosion accidents occur from time to time, also the casualties of the accidents cannot be underestimated. The minimum ignition temperature of dust as one of the characteristics of the dust explosion, it can not only measure the dust hazard, but also can provide an important basis for explosion-proof technology design and explosion-proof equipment selection. Therefore, studying the minimum ignition temperature bustible dusts has very important practical significance.
A standard Godbert-Greenwald furnace apparatus was used to measure the minimum ignition temperature of magnesium alloy dust, corn starch, sulfur dust, wood dust and coal dust. The effect of concentration, pressure, particle size, and humidity inert dust on the minimum ignition temperature bustible dusts was also studied. The test results show that:
( 1 ) Minimum ignition temperature decreases with the increasing of the dust
concentration, but when the concentration increased to a certain value, the minimum ignition temperature of dust is almost a constant, namely there is a sensitive concentration that at this concentration, the minimum ignition temperature of bustible dust is the lowest. And in this experiment, the sensitive concentration of magnesium alloy dust, corn starch, sulfur dust and coal dust is all 1364 g/m3, and the minimum ignition temperature of the four dusts is
respectively 615 ℃, 4