Rule of exclusion of powder unsafe factors in boiling drying equipment

Boiling drying is mainly used for drying dry wet granular materials such as tablets, granules and the like. The utility model has the advantages of high drying efficiency, uniform drying and high output, and is suitable for continuous production of the same variety, and has the advantages of low temperature, convenient operation and small occupied area. However, it is not easy to clean in the drying chamber, especially it is not suitable for the drying of colored particles, and the proportion of fine powder after drying is large.

The definition of dust explosion is that the dust particles suspended in the air are in full contact with the oxygen in the air, and the oxidation reaction is instantaneously completed under certain conditions, and a large amount of heat is released in the reaction, thereby generating a phenomenon of high temperature and high pressure. In general, flammable solids release energy when burned in air and produce a large amount of gas, and the rate at which energy is released is related to the rate at which the solid (dust) is exposed to the air.

Therefore, for a powder of the same solid substance, the smaller the particle size, the larger the specific area, the faster the combustion spreads. If the particle size of the solid is very fine, so that it can be suspended, once an ignition source is used to ignite it, a large amount of energy can be released in a very short time, and the energy is not too dissipated into the surrounding environment, resulting in the space. The gas is heated and absolutely expanded, while on the other hand, a large amount of gas is generated when the powder is burned, which causes the system to form a local high pressure, which causes explosion and propagation.

The literature believes that any dust explosion must have three elements, namely, 1 ignition source; 2 combustible fine dust; 3 dust floating in the air to form a dust cloud within the explosive concentration range. Among them, the three elements will exist at the same time to explode, so as long as one of the elements is eliminated, the dust explosion can be effectively prevented.

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