Analysis of Unsafe Factors of Powder in Boiling Dryer (1) boiling dryer powder factor static electricity generated in the boiling Discussion During the boiling and drying process of the boiling dryer , due to the intense friction between the drying gas and the surface of the material particles , the collision and friction between the dry solid particles will also occur , and the solid particles also interact with the cylinder wall , the collecting bag and the tube. Road dramatic collision with the wall surface friction, so that the surface of the solid particles with a large amount of static electricity; on the other hand, with the refined solid particles, resulting in a large number of fresh surface, the surface charge of the particles of the original state of equilibrium is destroyed, so that The surface of the new particles is heavily charged . Due to the aggregation , adhesion of the tube wall, etc. , once the grounding state of the whole machine is poor , the accumulated electrostatic charge can form a relatively high voltage , which under certain conditions may cause an electric spark generated by the electrostatic discharge . If the material to be dried is a flammable or explosive material , such a static spark can easily cause sudden burning or explosion of the dry material . (2) Discussion on the factors of dust explosion in boiling dryer Dust explosion is defined as dust suspended in the air and particles sufficiently contact with oxygen in the air, the oxidation reaction is instantaneous under certain conditions, a lot of heat evolved in the reaction, thereby generating high-temperature, high-pressure phenomenon. Generally, combustible solids in air the energy released during combustion, and produce large amounts of gas, the size of both the release rate of the speed of combustion energy in the solid (dust) in the area exposed to the air about. 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. absolute gas is heated and expanded, and a large amount of the powder combustion gases on the other hand, will form a local high pressure system, and even explosion propagation. (3) Discussion on the unsafe factors of powder in boiling dryer Since the material is boiled in a boiling dryer, it is easy to generate a large amount of dust , whether it is in a fluid boiling or a trapping operation , and the dust boiling is extremely likely to cause the above-mentioned static spark , which may cause an ignition source element . For dust clouds , as the combustible powder particles described in the literature are larger than 400 μm , the formed dust cloud is no longer explosive . When the above-mentioned "cloud of dust of powder particles at 10μm or less, the greater the risk, in the case of extremely fine particle size of the powder between the boiling dryer collection bag and the discharge conduit, most likely Therefore , there is a high possibility that there is a dust explosion factor for general materials . If the material contains combustible fine powder components , it means that there are three elements of dust explosion, and the possibility of dust explosion is extremely high .
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Below image as a reference:
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