Testile Testing Equipment

First, the oxygen index and the limit oxygen index , respectively, what is the meaning, what is the point? The limit oxygen index refers to the minimum oxygen concentration, also known as the oxygen limit and the oxygen index, required for the material to maintain the state of combustion in the oxygen-nitrogen mixture under specified test conditions. It is worth noting that the oxygen index does not refer to the oxygen fraction of oxygen gas mixed with the volume fraction of oxygen, this is the oxygen concentration value. Oxygen index is high that the material is not easy to burn, the oxygen index is low that the material is easy to burn, it is generally believed that the oxygen index <22 is a flammable material, oxygen index between 22 --- 27 is a combustible material, oxygen index> 27 is a flame retardant material. Second, how to calculate the limit oxygen index The limiting oxygen index LO I is expressed as a percentage by volume and is calculated as follows: LO

First, the filter speed Dust filter filter wind speed v refers to the average speed of the flue gas through the bag surface, v = Qt / 60F. Among them, Qt is the flue gas flow through the filter bag, m3 / h; F is the total area of ​​the filter bag, m2. The choice of filtration speed to consider the economy, filter bag life and filtration efficiency and other factors. When the same dust quality is accumulated on the surface of the bag, the accumulated dust collection rate decreases significantly with the increase of the filtration rate. In addition, the choice of filtration speed and cleaning methods, cleaning system, dust characteristics, inlet dust concentration and other factors are closely related. In general, for the low-pressure pulse jet cleaning dust filter speed ≤ 1.0m / min, additional dust pretreatment device after the filtration rate ≤ 1.1m / min; backflush cleaning method filtration speed ≤ 0.8m / min; dust Particles smaller, or the entrance of dust concentrat