Lower limit of explosion concentration of aluminum dust
The dust explosion limit includes the lower explosion limit and the upper explosion limit. The lower limit of dust explosion refers to the lowest concentration of dust in the air that can explode when exposed to a fire source. It is generally expressed by the mass of dust contained in a unit volume, and its unit is g/m3. The lower the lower explosion limit, the greater the risk of dust explosion. Different types of dust have different lower explosion limits, and the lower explosion limits of dusts of the same substance also change with changing conditions.
The dust explosion limit detector is suitable for the rapid determination of dust concentration, the detection of dust concentration in labor hygiene at the production site of industrial and mining enterprises, and the monitoring of inhalable dust concentration in the field of environmental protection. More than a thousand instruments have been used all over the country and have been well received by users.
The instrument complies with the Ministry of Labor's LD98-1996 "Light Scattering Method for Measuring Dust Concentration in the Air" standard and the Ministry of Railways TB/T2323-92 "The conversion method of relative mass concentration and mass concentration of dust in air instruments in railway work places" and other industry standards. .
Due to the super destructive power and extremely high incidence of dust explosion, it has received extensive attention from all walks of life in recent years. In addition to being widely used in industry, aluminum powder also has many uses in the military industry. However, Aluminum powder is flammable when wet, the lower explosion limit is low, and the ignition energy is small, which determines that there are great fire and explosion safety hazards in the production and storage process. TNT is widely used in military ammunition and engineering blasting. But. In the production process, it is easy to produce fine TNT dust. Once it is unconsciously lit, it will become the fuse of a huge disaster. The minimum ignition energy and lower explosion limit of dust determine whether dust explosions and dust explosions can occur. Two important parameters of the degree of difficulty. This paper studies the minimum ignition energy of aluminum powder and TNT dust and their lower explosion limits.